ALLIANT ENERGY CORP

For the period ended Dec 31, 2025. Filed Feb 20, 2026.

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.

FY2025 · Filed Feb 20, 2026

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

Extracted filing text, with the paragraph anchors used by the comparison.

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Contents

Definitions

The following abbreviations or acronyms used in this report are defined below:

Abbreviation or Acronym	Definition	Abbreviation or Acronym	Definition
2026 Alliant Energy Proxy Statement	Alliant Energy’s Proxy Statement for the 2026 Annual Meeting of Shareowners	GAAP	U.S. generally accepted accounting principles
AEF	Alliant Energy Finance, LLC	GHG	Greenhouse gases
AFUDC	Allowance for funds used during construction	IPL	Interstate Power and Light Company
Alliant Energy	Alliant Energy Corporation	IRS	Internal Revenue Service
ARO	Asset retirement obligation	ITC	ITC Midwest LLC
ATC	American Transmission Company LLC	IUC	Iowa Utilities Commission
ATC Holdings	Interest in American Transmission Company LLC and ATC Holdco LLC	KWh	Kilowatt-hour
ATI	AE Transco Investments, LLC	MDA	Management’s Discussion and Analysis of Financial Condition and Results of Operations
CA	Certificate of authority	MGP	Manufactured gas plant
CAA	Clean Air Act	MISO	Midcontinent Independent System Operator, Inc.
CCR	Coal combustion residuals	MW	Megawatt
CO2	Carbon dioxide	MWh	Megawatt-hour
Corporate Services	Alliant Energy Corporate Services, Inc.	N/A	Not applicable
CPCN	Certificate of Public Convenience and Necessity	Note(s)	Combined Notes to Consolidated Financial Statements
CSAPR	Cross-State Air Pollution Rule	OIP	Alliant Energy Omnibus Incentive Plan
CWIP	Construction work in progress	OPEB	Other postretirement benefits
DAEC	Duane Arnold Energy Center	PPA	Purchased power agreement
DCP	Alliant Energy Deferred Compensation Plan	PSCW	Public Service Commission of Wisconsin
Dth	Dekatherm	Receivables Agreement	Receivables Purchase and Sale Agreement
EGU	Electric generating unit	SEC	Securities and Exchange Commission
EPA	U.S. Environmental Protection Agency	U.S.	United States of America
EPS	Earnings per weighted average common share	VEBA	Voluntary Employees’ Beneficiary Association
FERC	Federal Energy Regulatory Commission	VIE	Variable interest entity
Financial Statements	Consolidated Financial Statements	West Riverside	West Riverside Energy Center and Solar Facility
FTR	Financial transmission right	WPL	Wisconsin Power and Light Company
Fuel-related	Electric production fuel and purchased power

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.