Exhibit 4.15 GUARANTEE AGREEMENT KeySpan Trust __ Dated as of _________ ___, ______ CROSS REFERENCE TABLE*Guarantee Agreement • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction
andAgreement • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction
Exhibit 1.1 KEYSPAN CORPORATION DEBT SECURITIES [Form of Underwriting Agreement]Keyspan Trust I • February 6th, 2002 • Natural gas distribution • New York
Company FiledFebruary 6th, 2002 Industry Jurisdiction
ANDSupplemental Indenture • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction
and ----------, As Purchase Contract Agent FORM OF PURCHASE CONTRACT AGREEMENTPurchase Contract Agreement • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction
FORM OFStock Warrant Agreement • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction
ANDDeposit Agreement • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction
FORM OF [SENIOR] [SUBORDINATED] DEBT WARRANT AGREEMENT*Warrant Agreement • February 6th, 2002 • Keyspan Trust I • Natural gas distribution • New York
Contract Type FiledFebruary 6th, 2002 Company Industry Jurisdiction