INDENTURE Dated as of November 20, 2020 Among ALLIANT ENERGY FINANCE, LLC, as Issuer, ALLIANT ENERGY CORPORATION, as Guarantor and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee 1.400% SENIOR NOTES DUE 2026Indenture • November 23rd, 2020 • Alliant Energy Corp • Electric & other services combined • New York
