Common use of Ratification of Indenture; Supplemental Indenture Part of Indenture Clause in Contracts

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11, 2015 DYNEGY INC. By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer DYNEGY RESOURCE HOLDINGS, LLC, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE I, LLC DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY FAYETTE II, LLC DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY MORRO BAY, LLC DYNEGY XXXX LANDING, LLC DYNEGY OAKLAND, LLC DYNEGY OPERATING COMPANY DYNEGY POWER, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC RICHLAND GENERATION EXPANSION, LLC MILFORD POWER COMPANY, LLC LAKE ROAD HOLDINGS GP, LLC LAKE ROAD HOLDINGS LP, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGS, LLC LEP HOLDINGS, LLC LIBERTY ELECTRIC PA 2, LLC LIBERTY ELECTRIC POWER, LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Name: Xxxxx Xxxxxxx Title: Vice President [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 Americas 92491485 v3 EXHIBIT 4.1 Exhibit 4.41 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 7, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the First Supplemental Indenture (8.034% 2024 Notes)] Americas 92491485 v3 Exhibit 4.41 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGSCOFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANYILLINOIS POWER RESOURCES, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IPH II, LLC XXXXXXX POINT HOLDINGSIPH, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth First Supplemental Indentures Indenture (20198.034% 2024 Notes)] AMERICAS 90565110 Americas 92491485 v3 EXHIBIT 4.1 Exhibit 4.41 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the First Supplemental Indenture (8.034% 2024 Notes)] Americas 92491485 v3 Exhibit 4.41 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the First Supplemental Indenture (8.034% 2024 Notes)] Americas 92491485 v3 Exhibit 4.41 SUBSIDIARY GUARANTORS: ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC. [Signature Page to the First Supplemental Indenture (8.034% 2024 Notes)] Americas 92491485 v3 Exhibit 4.41 By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the First Supplemental Indenture (8.034% 2024 Notes)] Americas 92491485 v3 Exhibit 4.41 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth First Supplemental Indentures Indenture (20198.034% 2024 Notes)] AMERICAS 90565110 v3Americas 92491485 v3 Exhibit 4.41 SCHEDULE I SUBSIDIARY GUARANTEES ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC.

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 EXECUTION VERSION IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11September 21, 2015 DYNEGY INC. By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer DYNEGY RESOURCE HOLDINGSSITHE/INDEPENDENCE POWER PARTNERS, L.P. By: Sithe/Independence LLC, its General Partner By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (2019)] AMERICAS 90565110 v3 Americas 90776548 EXHIBIT 4.1 EXECUTION VERSION SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE HOLDINGS, LLC DYNEGY RESOURCE I, LLC DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY FAYETTE II, LLC DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & and Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (2019)] AMERICAS 90565110 v3 Americas 90776548 EXHIBIT 4.1 EXECUTION VERSION BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY MORRO BAY, LLC DYNEGY XXXX LANDING, LLC DYNEGY OAKLAND, LLC DYNEGY OPERATING COMPANY DYNEGY POWER, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (2019)] AMERICAS 90565110 v3 Americas 90776548 EXHIBIT 4.1 EXECUTION VERSION EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC RICHLAND GENERATION EXPANSION, LLC MILFORD POWER COMPANY, LLC LAKE ROAD HOLDINGS GP, LLC LAKE ROAD HOLDINGS LP, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGS, LLC LEP HOLDINGS, LLC LIBERTY ELECTRIC PA 2, LLC LIBERTY ELECTRIC POWER, LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (2019)] AMERICAS 90565110 v3 Americas 90776548 EXHIBIT 4.1 EXECUTION VERSION WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Name: Xxxxx Xxxxxxx Title: Vice President [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (2019)] AMERICAS 90565110 v3Americas 90776548

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 Americas 90776895 EXHIBIT 4.1 4.3 EXECUTION VERSION IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11September 21, 2015 DYNEGY INC. By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer DYNEGY RESOURCE HOLDINGSSITHE/INDEPENDENCE POWER PARTNERS, L.P. By: Sithe/Independence LLC, its General Partner By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192024)] AMERICAS 90565110 v3 Americas 90776895 EXHIBIT 4.1 4.3 EXECUTION VERSION SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE HOLDINGS, LLC DYNEGY RESOURCE I, LLC DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY FAYETTE II, LLC DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & and Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192024)] AMERICAS 90565110 v3 Americas 90776895 EXHIBIT 4.1 4.3 EXECUTION VERSION BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY MORRO BAY, LLC DYNEGY XXXX LANDING, LLC DYNEGY OAKLAND, LLC DYNEGY OPERATING COMPANY DYNEGY POWER, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192024)] AMERICAS 90565110 v3 Americas 90776895 EXHIBIT 4.1 4.3 EXECUTION VERSION EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC RICHLAND GENERATION EXPANSION, LLC MILFORD POWER COMPANY, LLC LAKE ROAD HOLDINGS GP, LLC LAKE ROAD HOLDINGS LP, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGS, LLC LEP HOLDINGS, LLC LIBERTY ELECTRIC PA 2, LLC LIBERTY ELECTRIC POWER, LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192024)] AMERICAS 90565110 v3 Americas 90776895 EXHIBIT 4.1 4.3 EXECUTION VERSION WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Name: Xxxxx Xxxxxxx Title: Vice President [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192024)] AMERICAS 90565110 v3Americas 90776895

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92202005 v5 Exhibit 4.24 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 2, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Sixth Supplemental Indenture (2022 Notes)] Americas 92202005 v5 Exhibit 4.24 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGSBy: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Sixth Supplemental Indenture (2022 Notes)] Americas 92202005 v5 Exhibit 4.24 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Sixth Supplemental Indenture (2022 Notes)] Americas 92202005 v5 Exhibit 4.24 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Sixth Supplemental Indenture (2022 Notes)] Americas 92202005 v5 Exhibit 4.24 SUBSIDIARY GUARANTORS: COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANYILLINOIS POWER RESOURCES, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IPH II, LLC XXXXXXX POINT HOLDINGSIPH, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192022 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92202005 v5 Exhibit 4.24 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192022 Notes)] AMERICAS 90565110 v3Americas 92202005 v5 Exhibit 4.24 SCHEDULE I SUBSIDIARY GUARANTEES COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 90567382 v3 EXHIBIT 4.1 4.3 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11, 2015 DYNEGY INC. By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer DYNEGY RESOURCE HOLDINGS, LLC, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192024)] AMERICAS 90565110 90567382 v3 EXHIBIT 4.1 4.3 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE I, LLC DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY FAYETTE II, LLC DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192024)] AMERICAS 90565110 90567382 v3 EXHIBIT 4.1 4.3 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY MORRO BAY, LLC DYNEGY XXXX LANDING, LLC DYNEGY OAKLAND, LLC DYNEGY OPERATING COMPANY DYNEGY POWER, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192024)] AMERICAS 90565110 90567382 v3 EXHIBIT 4.1 4.3 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC RICHLAND GENERATION EXPANSION, LLC MILFORD POWER COMPANY, LLC LAKE ROAD HOLDINGS GP, LLC LAKE ROAD HOLDINGS LP, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGS, LLC LEP HOLDINGS, LLC LIBERTY ELECTRIC PA 2, LLC LIBERTY ELECTRIC POWER, LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192024)] AMERICAS 90565110 90567382 v3 EXHIBIT 4.1 4.3 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Name: Xxxxx Xxxxxxx Title: Vice President [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192024)] AMERICAS 90565110 90567382 v3

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260896 v6 Exhibit 4.8 Americas 92260896 v6 Exhibit 4.8 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 7, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Seventh Supplemental Indenture (2023 Notes)] Americas 92260896 v6 Exhibit 4.8 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGSCOFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANYILLINOIS POWER RESOURCES, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IPH II, LLC XXXXXXX POINT HOLDINGSIPH, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192023 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260896 v6 Exhibit 4.8 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Seventh Supplemental Indenture (2023 Notes)] Americas 92260896 v6 Exhibit 4.8 SUBSIDIARY GUARANTORS: ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC. By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Seventh Supplemental Indenture (2023 Notes)] Americas 92260896 v6 Exhibit 4.8 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192023 Notes)] AMERICAS 90565110 v3Americas 92260896 v6 Exhibit 4.8 SCHEDULE I SUBSIDIARY GUARANTEES ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC.

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92203420 v5 Exhibit 4.35 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 2, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the First Supplemental Indenture (2025 Notes)] Americas 92203420 v5 Exhibit 4.35 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth First Supplemental Indentures Indenture (20192025 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92203420 v5 Exhibit 4.35 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the First Supplemental Indenture (2025 Notes)] Americas 92203420 v5 Exhibit 4.35 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Freeland________ Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the First Supplemental Indenture (2025 Notes)] Americas 92203420 v5 Exhibit 4.35 SUBSIDIARY GUARANTORS: COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC By: /s/ Xxxxx X. Freeland________ Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the First Supplemental Indenture (2025 Notes)] Americas 92203420 v5 Exhibit 4.35 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth First Supplemental Indentures Indenture (20192025 Notes)] AMERICAS 90565110 v3Americas 92203420 v5 Exhibit 4.35 SCHEDULE I SUBSIDIARY GUARANTEES COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260838 v6 Exhibit 4.17 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 7, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Seventh Supplemental Indenture (2019 Notes)] Americas 92260838 v6 Exhibit 4.17 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGSCOFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANYILLINOIS POWER RESOURCES, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IPH II, LLC XXXXXXX POINT HOLDINGSIPH, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192019 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260838 v6 Exhibit 4.17 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Seventh Supplemental Indenture (2019 Notes)] Americas 92260838 v6 Exhibit 4.17 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Seventh Supplemental Indenture (2019 Notes)] Americas 92260838 v6 Exhibit 4.17 SUBSIDIARY GUARANTORS: ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC. By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Seventh Supplemental Indenture (2019 Notes)] Americas 92260838 v6 Exhibit 4.17 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192019 Notes)] AMERICAS 90565110 v3Americas 92260838 v6 Exhibit 4.17 SCHEDULE I SUBSIDIARY GUARANTEES ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC.

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92201989 v5 Exhibit 4.16 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 2, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Sixth Supplemental Indenture (2019 Notes)] Americas 92201989 v5 Exhibit 4.16 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192019 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92201989 v5 Exhibit 4.16 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Sixth Supplemental Indenture (2019 Notes)] Americas 92201989 v5 Exhibit 4.16 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Sixth Supplemental Indenture (2019 Notes)] Americas 92201989 v5 Exhibit 4.16 SUBSIDIARY GUARANTORS: COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192019 Notes)] AMERICAS 90565110 v3Americas 92201989 v5 Exhibit 4.16 SCHEDULE I SUBSIDIARY GUARANTEES COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 90567380 v3 EXHIBIT 4.1 4.2 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11, 2015 DYNEGY INC. By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer DYNEGY RESOURCE HOLDINGS, LLC, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192022)] AMERICAS 90565110 90567380 v3 EXHIBIT 4.1 4.2 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE I, LLC DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY FAYETTE II, LLC DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192022)] AMERICAS 90565110 90567380 v3 EXHIBIT 4.1 4.2 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY MORRO BAY, LLC DYNEGY XXXX LANDING, LLC DYNEGY OAKLAND, LLC DYNEGY OPERATING COMPANY DYNEGY POWER, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192022)] AMERICAS 90565110 90567380 v3 EXHIBIT 4.1 4.2 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC RICHLAND GENERATION EXPANSION, LLC MILFORD POWER COMPANY, LLC LAKE ROAD HOLDINGS GP, LLC LAKE ROAD HOLDINGS LP, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGS, LLC LEP HOLDINGS, LLC LIBERTY ELECTRIC PA 2, LLC LIBERTY ELECTRIC POWER, LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192022)] AMERICAS 90565110 90567380 v3 EXHIBIT 4.1 4.2 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Name: Xxxxx Xxxxxxx Title: Vice President [Signature page to the EquiPower Notes Fourth Supplemental Indentures (20192022)] AMERICAS 90565110 90567380 v3

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92202010 v5 Exhibit 4.7 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 2, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Sixth Supplemental Indenture (2023 Notes)] Americas 92202010 v5 Exhibit 4.7 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192023 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92202010 v5 Exhibit 4.7 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Sixth Supplemental Indenture (2023 Notes)] Americas 92202010 v5 Exhibit 4.7 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Sixth Supplemental Indenture (2023 Notes)] Americas 92202010 v5 Exhibit 4.7 SUBSIDIARY GUARANTORS: COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Sixth Supplemental Indenture (2023 Notes)] Americas 92202010 v5 Exhibit 4.7 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192023 Notes)] AMERICAS 90565110 v3Americas 92202010 v5 Exhibit 4.7 SCHEDULE I SUBSIDIARY GUARANTEES COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92202015 v5 Exhibit 4.32 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 2, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Sixth Supplemental Indenture (2024 Notes)] Americas 92202015 v5 Exhibit 4.32 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192024 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92202015 v5 Exhibit 4.32 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Sixth Supplemental Indenture (2024 Notes)] Americas 92202015 v5 Exhibit 4.32 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Sixth Supplemental Indenture (2024 Notes)] Americas 92202015 v5 Exhibit 4.32 SUBSIDIARY GUARANTORS: COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Sixth Supplemental Indenture (2024 Notes)] Americas 92202015 v5 Exhibit 4.32 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Sixth Supplemental Indentures Indenture (20192024 Notes)] AMERICAS 90565110 v3Americas 92202015 v5 Exhibit 4.32 SCHEDULE I SUBSIDIARY GUARANTEES COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 4.2 EXECUTION VERSION IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11September 21, 2015 DYNEGY INC. By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer DYNEGY RESOURCE HOLDINGSSITHE/INDEPENDENCE POWER PARTNERS, L.P. By: Sithe/Independence LLC, its General Partner By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192022)] AMERICAS 90565110 v3 Americas 90776598 EXHIBIT 4.1 4.2 EXECUTION VERSION SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE HOLDINGS, LLC DYNEGY RESOURCE I, LLC DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY FAYETTE II, LLC DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & and Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192022)] AMERICAS 90565110 v3 Americas 90776598 EXHIBIT 4.1 4.2 EXECUTION VERSION BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY MORRO BAY, LLC DYNEGY XXXX LANDING, LLC DYNEGY OAKLAND, LLC DYNEGY OPERATING COMPANY DYNEGY POWER, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192022)] AMERICAS 90565110 v3 Americas 90776598 EXHIBIT 4.1 4.2 EXECUTION VERSION EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC RICHLAND GENERATION EXPANSION, LLC MILFORD POWER COMPANY, LLC LAKE ROAD HOLDINGS GP, LLC LAKE ROAD HOLDINGS LP, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGS, LLC LEP HOLDINGS, LLC LIBERTY ELECTRIC PA 2, LLC LIBERTY ELECTRIC POWER, LLC TOMCAT POWER, LLC XXXXXXX HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANY, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXXX POINT HOLDINGS, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192022)] AMERICAS 90565110 v3 Americas 90776598 EXHIBIT 4.1 4.2 EXECUTION VERSION WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Name: Xxxxx Xxxxxxx Title: Vice President [Signature page to the EquiPower Notes Fourth Fifth Supplemental Indentures (20192022)] AMERICAS 90565110 v3Americas 90776598

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260868 v6 Exhibit 4.25 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 7, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Seventh Supplemental Indenture (2022 Notes)] Americas 92260868 v6 Exhibit 4.25 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX COFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC ILLINOIS POWER RESOURCES, LLC IPH II, LLC IPH, LLC By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Seventh Supplemental Indenture (2022 Notes)] Americas 92260868 v6 Exhibit 4.25 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Seventh Supplemental Indenture (2022 Notes)] Americas 92260868 v6 Exhibit 4.25 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Seventh Supplemental Indenture (2022 Notes)] Americas 92260868 v6 Exhibit 4.25 SUBSIDIARY GUARANTORS: ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES XXXXX POWER COMPANY, LLC XXXXXX EXPANSION HOLDINGSDYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IIT-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX POINT HOLDINGSCOUNTY GENERATION, LLC ECP IIWISE COUNTY POWER COMPANY, LLC WISE-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP FUELS PIPELINE, INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx [Signature Page to the Seventh Supplemental Indenture (2022 Notes)] Americas 92260868 v6 Exhibit 4.25 Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192022 Notes)] AMERICAS 90565110 v3Americas 92260868 v6 Exhibit 4.25 SCHEDULE I SUBSIDIARY GUARANTEES ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC.

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260805 v6 Exhibit 4.36 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 7, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Second Supplemental Indenture (2025 Notes)] Americas 92260805 v6 Exhibit 4.36 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGSCOFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANYILLINOIS POWER RESOURCES, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IPH II, LLC XXXXXXX POINT HOLDINGSIPH, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Second Supplemental Indentures Indenture (20192025 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260805 v6 Exhibit 4.36 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Second Supplemental Indenture (2025 Notes)] Americas 92260805 v6 Exhibit 4.36 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Second Supplemental Indenture (2025 Notes)] Americas 92260805 v6 Exhibit 4.36 SUBSIDIARY GUARANTORS: ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC. By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Second Supplemental Indenture (2025 Notes)] Americas 92260805 v6 Exhibit 4.36 [SIGNATURE PAGES CONTINUE] [Signature Page to the Second Supplemental Indenture (2025 Notes)] Americas 92260805 v6 Exhibit 4.36 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Second Supplemental Indentures Indenture (20192025 Notes)] AMERICAS 90565110 v3Americas 92260805 v6 Exhibit 4.36 SCHEDULE I SUBSIDIARY GUARANTEES ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC.

Ratification of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder of Notes heretofore or hereafter authenticated and delivered shall be bound hereby. [Signature Page Follows] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260932 v6 Exhibit 4.33 IN WITNESS WHEREOF, we have hereunto signed our names as of the date set forth below. Dated: May 11February 7, 2015 2017 DYNEGY INC. By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer DYNEGY RESOURCE HOLDINGSBLACK MOUNTAIN COGEN, LLCXXX.XXXX RIDGE GENERATION LLCCASCO BAY ENERGY COMPANY, By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President and Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 SUBSIDIARY GUARANTORS: DYNEGY ENERGY SERVICES (EAST), LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer DYNEGY RESOURCE ILLCDIGHTON POWER, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANYDYNEGY COAL GENERATION, LLC DYNEGY COAL HOLDCO, LLCDYNEGY COAL INVESTMENTS HOLDINGS, LLCDYNEGY COAL TRADING & TRANSPORTATION, L.L.C.DYNEGY COMMERCIAL ASSET MANAGEMENT, LLC DYNEGY CONESVILLE, LLC DYNEGY DICKS CREEK, LLC DYNEGY ENERGY SERVICES (EAST), LLC DYNEGY ENERGY SERVICES, LLCDYNEGY EQUIPMENT, LLCDYNEGY FAYETTE II, LLC DYNEGY GAS GENERATION, LLC DYNEGY GAS HOLDCO, LLCDYNEGY GAS IMPORTS, LLCDYNEGY GAS INVESTMENTS HOLDINGS, LLCDYNEGY GAS INVESTMENTS, LLCDYNEGY GASCO HOLDINGS, LLCDYNEGY GENERATION HOLDCO, LLCDYNEGY GLOBAL LIQUIDS, INC.DYNEGY HANGING ROCK II, LLC DYNEGY XXXXXXX ENERGY, LLCDYNEGY XXXXXX, LLC DYNEGY XXX XX, LLC DYNEGY MIAMI FORT, LLC DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC DYNEGY COAL GENERATION, LLC DYNEGY GAS GENERATION, LLC DYNEGY GENERATION HOLDCO, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer DYNEGY ENERGY SERVICES, LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 BLUE RIDGE GENERATION LLC BLACK MOUNTAIN COGEN, INC. CASCO BAY ENERGY COMPANY, LLC DYNEGY ADMINISTRATIVE SERVICES COMPANY DYNEGY COAL HOLDCO, LLC DYNEGY COAL INVESTMENTS HOLDINGS, LLC DYNEGY COAL TRADING & TRANSPORTATION, L.L.C. DYNEGY EQUIPMENT, LLC DYNEGY GASCO HOLDINGS, LLC DYNEGY GAS HOLDCO, LLC DYNEGY GAS IMPORTS, LLC DYNEGY GAS INVESTMENTS, LLC DYNEGY GAS INVESTMENTS HOLDINGS, LLC DYNEGY GLOBAL LIQUIDS, INC. DYNEGY XXXXXXX ENERGY, LLC DYNEGY MARKETING AND TRADE, LLCDYNEGY MIAMI FORT, LLC DYNEGY MIDWEST GENERATION, LLC DYNEGY LLCDYNEGY MORRO BAY, LLC DYNEGY LLCDYNEGY XXXX LANDING, LLCDYNEGY OAKLAND, LLCDYNEGY OPERATING COMPANYDYNEGY POWER GENERATION INC.DYNEGY POWER MARKETING, LLCDYNEGY POWER, LLC [Signature Page to the Seventh Supplemental Indenture (2024 Notes)] Americas 92260932 v6 Exhibit 4.33 DYNEGY OAKLANDRESOURCE HOLDINGS, LLC DYNEGY OPERATING COMPANY DYNEGY POWERRESOURCE I, LLC DYNEGY POWER GENERATION INC. DYNEGY POWER MARKETING, LLC DYNEGY SOUTH BAY, LLC HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION ONTELAUNEE POWER OPERATING COMPANY, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: President & Chief Executive Officer [SIGNATURE PAGES CONTINUE] [Signature page to the EquiPower Notes Fourth Supplemental Indentures (2019)] AMERICAS 90565110 v3 EXHIBIT 4.1 EQUIPOWER RESOURCES CORP. DYNEGY RESOURCE II, LLC DYNEGY RESOURCE III, LLC DYNEGY RESOURCES GENERATING HOLDCO, LLC DYNEGY RESOURCES HOLDCO I, LLC DYNEGY RESOURCES HOLDCO II, LLC DYNEGY RESOURCES GENERATING HOLDCOMANAGEMENT, LLC RICHLAND GENERATION EXPANSIONDYNEGY SOUTH BAY, LLC MILFORD POWER DYNEGY STUART, LLC DYNEGY WASHINGTON II, LLC DYNEGY XXXXXX, LLC XXXXXX ENERGY HOLDINGS II, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX EXPANSION HOLDINGS, LLC EQUIPOWER RESOURCES CORP. HAVANA DOCK ENTERPRISES, LLC ILLINOVA CORPORATION XXXXXXX ENERGY SERVICES COMPANY, LLC LAKE ROAD HOLDINGS GPXXXXXXX GENERATION, LLC LAKE ROAD HOLDINGS LPL.L.C. XXXXXXX HOLDINGS, LLC LAKE ROAD GENERATING COMPANY, L.P. RSG POWER, LLC RICHLAND-STRYKER GENERATION LLC DYNEGY RESOURCES MANAGEMENT, LLC DIGHTON LIBERTY ELECTRIC POWER, LLC MASSPOWER HOLDCO, LLC MASSPOWER PARTNERS I, LLC MASSPOWER PARTNERS II, LLC MASSPOWER LIBERTY ELECTRIC GENERATION HOLDINGSMILFORD POWER COMPANY, LLC LEP HOLDINGSONTELAUNEE POWER OPERATING COMPANY, LLC LIBERTY ELECTRIC PA 2RICHLAND GENERATION EXPANSION, LLC LIBERTY ELECTRIC RICHLAND-STRYKER GENERATION LLC RSG POWER, LLC SITHE ENERGIES, INC. SITHE/INDEPENDENCE LLC TOMCAT POWER, LLC XXXXXXX HOLDINGSCOFFEEN AND WESTERN RAILROAD COMPANY ILLINOIS POWER FUELS AND SERVICES COMPANY ILLINOIS POWER GENERATING COMPANY ILLINOIS POWER MARKETING COMPANY ILLINOIS POWER RESOURCES GENERATING, LLC XXXXXXX GENERATION, L.L.C. XXXXXXX ENERGY SERVICES COMPANYILLINOIS POWER RESOURCES, LLC XXXXXX EXPANSION HOLDINGS, LLC XXXXXX ENERGY HOLDINGS, LLC XXXXXX SERVICES COMPANY, LLC XXXXXX ENERGY HOLDINGS IPH II, LLC XXXXXXX POINT HOLDINGSIPH, LLC ECP II-B (XXXXXXX POINT IP) CORP ECP II-C (XXXXXXX POINT IP) CORP By: /s/ Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Xxxxxxxx Title: Executive Vice President and Chief Executive Financial Officer [SIGNATURE PAGES CONTINUE] [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192024 Notes)] AMERICAS 90565110 v3 EXHIBIT 4.1 Americas 92260932 v6 Exhibit 4.33 MASSPOWER, a Massachusetts general partnership By: Masspower Partner II, LLC, its Managing Partner By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Seventh Supplemental Indenture (2024 Notes)] Americas 92260932 v6 Exhibit 4.33 MASSPOWER, a Massachusetts general partnership By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [Signature Page to the Seventh Supplemental Indenture (2024 Notes)] Americas 92260932 v6 Exhibit 4.33 SUBSIDIARY GUARANTORS: ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC. [Signature Page to the Seventh Supplemental Indenture (2024 Notes)] Americas 92260932 v6 Exhibit 4.33 By: /s/ Xxxxx X. Xxxxxxxx Name: Xxxxx X. Xxxxxxxx Title: Executive Vice President and Chief Financial Officer [SIGNATURE PAGES CONTINUE] [Signature Page to the Seventh Supplemental Indenture (2024 Notes)] Americas 92260932 v6 Exhibit 4.33 WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee By: /s/ Xxxxx Xxxxxxx Xxxxxxxx Name: Xxxxx Xxxxxxx Xxxxxxxx Title: Assistant Vice President [Signature page Page to the EquiPower Notes Fourth Seventh Supplemental Indentures Indenture (20192024 Notes)] AMERICAS 90565110 v3Americas 92260932 v6 Exhibit 4.33 SCHEDULE I SUBSIDIARY GUARANTEES ANP BELLINGHAM ENERGY COMPANY, LLC ANP BLACKSTONE ENERGY COMPANY, LLC ANP ERCOT ACQUISITION, LLC ANP FUEL SERVICES, INC. ANP FUNDING I, LLC XXXXXXXXX POWER, LLC ATLAS ADMINISTRATIVE SERVICES, LLC ATLAS FINANCE MERGECO, LLC ATLAS I MARKETING AND TRADE, LLC ATLAS POWER FINANCE, LLC ATLAS POWER, LLC CALUMET ENERGY TEAM, LLC COLETO CREEK POWER XX XXXXXX GP, LLC COLETO LP, LLC DYNEGY ATLAS HOLDINGS, LLC XXXXX POWER COMPANY, LLC DYNEGY GENERATION NA, INC. (F/K/A GDF SUEZ ENERGY GENERATION NA, INC.) DYNEGY ENERGY GENERATION NA, LLC (F/K/A GDF SUEZ ENERGY GENERATION NA, LLC) DYNEGY NORTH AMERICA, INC. (F/K/A GDF SUEZ ENERGY NORTH AMERICA, INC.) XXXX ENERGY, LLC HOPEWELL COGENERATION LIMITED PARTNERSHIP HOPEWELL COGENERATION, LLC DYNEGY POWER AMERICA, INC. (F/K/A INTERNATIONAL POWER AMERICA, INC.) DP GENERATION, LLC (F/K/A IPA APT GENERATION, LLC) DP CENTRAL, LLC (F/K/A IPA CENTRAL, LLC) DP HOLDING, INC. (F/K/A IPA HOLDING, INC.) DP OPERATIONS, INC. (F/K/A IPA OPERATIONS, INC.) MIDLOTHIAN ENERGY, LLC MILFORD POWER, LLC NEPCO SERVICES COMPANY NORTHEASTERN POWER COMPANY XXXXXXXXX ENERGY, LLC PRINCE XXXXXX ENERGY COMPANY, LLC T-FUELS, LLC TNA MERCHANT PROJECTS, INC. DYNEGY ASSOCIATES NORTHEAST LP, INC. (F/K/A TRACTEBEL ASSOCIATES NORTHEAST LP, INC.) DYNEGY NORTHEAST GENERATION GP, INC. (F/K/A TRACTEBEL NORTHEAST GENERATION GP, INC.) XXXX ENERGY, LLC XXXXXXX COUNTY GENERATION, LLC WISE COUNTY POWER COMPANY, LLC WISE-FUELS PIPELINE, INC.