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 , ALLIANT ENERGY CORP DONNELLEY FINANCIAL SOLUTIONS /FA/08/21/2026
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424B5Prospectus filed pursuant to Rule 424(b)(5)Interstate Power & Light Co DONNELLEY FINANCIAL SOLUTIONS /FA/08/20/2026
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FWPFiling under Securities Act Rules 163/43...Interstate Power & Light Co DONNELLEY FINANCIAL SOLUTIONS /FA/08/18/2026
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424B5Prospectus filed pursuant to Rule 424(b)(5)Interstate Power & Light Co DONNELLEY FINANCIAL SOLUTIONS /FA/08/18/2026
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8-KCurrent report filingINTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 07/31/2026
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10-QQuarterly report pursuant to Section 13 ...INTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 07/31/2026
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8-KCurrent report filingINTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 05/01/2026
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10-QQuarterly report pursuant to Section 13 ...INTERSTATE POWER & LIGHT CO , WISCONSIN POWER & LIGHT CO , ALLIANT ENERGY CORP 05/01/2026
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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 02/20/2026
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