ALLIANT ENERGY CORP

For the period ended Dec 31, 2024. Filed Feb 21, 2025.

About this filing

A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2024 · Filed Feb 21, 2025

LNT$72.67-1.0%Stored close · as of Nov 6, 2026

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Contents

	Page Number
Definitions	1
Forward-looking Statements	1
Website Access to Reports	3
Part I.	Item 1. Business	3
	Item 1A. Risk Factors	16
	Item 1B. Unresolved Staff Comments	22
	Item 1C. Cybersecurity	23
	Item 2. Properties	24
	Item 3. Legal Proceedings	26
	Item 4. Mine Safety Disclosures	26
	Information About Executive Officers	26
Part II.	Item 5. Market for Registrants’ Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	27
	Item 6. [Reserved]	27
	Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations	27
	Item 7A. Quantitative and Qualitative Disclosures About Market Risk	46
	Item 8. Financial Statements and Supplementary Data	46
		Alliant Energy Corporation	47
		Interstate Power and Light Company	53
		Wisconsin Power and Light Company	59
		Combined Notes to Consolidated Financial Statements	65
			1. Summary of Significant Accounting Policies	65
			2. Regulatory Matters	71
			3. Property, Plant and Equipment	74
			4. Jointly-owned Electric Utility Plant	75
			5. Receivables	76
			6. Investments	77
			7. Common Equity	77
			8. Debt	78
			9. Leases	81
			10. Revenues	82
			11. Income Taxes	83
			12. Benefit Plans	85
			13. Asset Retirement Obligations	94
			14. Derivative Instruments	94
			15. Fair Value Measurements	95
			16. Commitments and Contingencies	97
			17. Segments of Business	100
			18. Related Parties	101
	Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	102
	Item 9A. Controls and Procedures	102
	Item 9B. Other Information	104
	Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections	104
Part III.	Item 10. Directors, Executive Officers and Corporate Governance	104
	Item 11. Executive Compensation	104
	Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	104
	Item 13. Certain Relationships and Related Transactions, and Director Independence	105
	Item 14. Principal Accounting Fees and Services	105
Part IV.	Item 15. Exhibits, Financial Statement Schedules	105
Signatures	111

ContentsView on SEC.gov

The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.

About this filing

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