0000352541 2026-03-19 2026-03-19 0000352541 1 2026-03-19 2026-03-19 iso4217:USD pure S-3 424B5 EX-FILING FEES 333-276062 0000352541 ALLIANT ENERGY CORP N/A N/A S-3 ALLIANT ENERGY CORP false Equity Common stock, par value $0.01 per share true 1000000000.00 0.0001381 138100.00 1000000000.00 138100.00 0.00 0.00 138100.00 Calculated in accordance with Rule 457(o) under the Securities Act, based on the proposed maximum aggregate offering price, and Rule 457(r) under the Securities Act. The fee payable in connection with the offering pursuant to this prospectus supplement is being paid herewith in accordance with Rule 456(b) under the Securities Act, and represents deferred payment of the registration fees in connection with the registrant's Registration Statement on Form S-3ASR (Registration No. 333-276062). 1000000000.00 true