Interstate Power & Light prices $600M 5.600% senior debentures due 2035

ALLIANT ENERGY CORP

IPL issued $600M aggregate principal of 5.600% senior debentures due June 29, 2035.
Net proceeds to retire $50M 5.50% debentures due July 2025 and $250M 3.40% debentures due Aug 2025.
Proceeds also used to reduce commercial paper and receivables program; closing expected May 19, 2025.
Joint book-running managers: BofA Securities, Mizuho, MUFG Securities Americas, and Wells Fargo Securities.

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