INTERSTATE POWER & LIGHT CO
SEC Filing List

CIK: 0000052485
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Form Description Owner/Filer Filing Agent Date Actions
8-KCurrent report filingINTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 02/20/2026
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10-KAnnual report pursuant to Section 13 and...INTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 02/20/2026
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8-KCurrent report filingINTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 01/08/2026
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8-KCurrent report filingINTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 12/16/2025
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8-KCurrent report filingINTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 11/07/2025
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10-QQuarterly report pursuant to Section 13 ...INTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 11/07/2025
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POSASRPost-effective Amendment to an automatic...INTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP DONNELLEY FINANCIAL SOLUTIONS /FA/09/22/2025
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8-KCurrent report filingINTERSTATE POWER & LIGHT CO , ALLIANT ENERGY CORP 09/11/2025
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424B5Prospectus filed pursuant to Rule 424(b)(5)Interstate Power & Light Co DONNELLEY FINANCIAL SOLUTIONS /FA/09/10/2025
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FWPFiling under Securities Act Rules 163/43...DONNELLEY FINANCIAL SOLUTIONS /FA/09/08/2025
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