0000352541 2026-07-30 2026-07-30 0000352541 lnt:IplMember 2026-07-30 2026-07-30 0000352541 lnt:WplMember 2026-07-30 2026-07-30 0000352541 0000052485 0000107832 false 8-K 2026-07-30 ALLIANT ENERGY CORP WI 4902 N. Biltmore Lane Madison WI 53718 608 458-3311 1-9894 39-1380265 INTERSTATE POWER & LIGHT CO IA Alliant Energy Tower Cedar Rapids IA 52401 319 786-4411 1-4117 42-0331370 WISCONSIN POWER & LIGHT CO WI 4902 N. Biltmore Lane Madison WI 53718 608 458-3311 0-337 39-0714890 false false false false Common Stock, $0.01 Par Value LNT NASDAQ false false false