ALLIANT ENERGY CORP

For the period ended Dec 31, 2023. Filed Feb 16, 2024.

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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.

FY2023 · Filed Feb 16, 2024

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

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Contents

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorized on the 16th day of February 2024.

ALLIANT ENERGY	INTERSTATE POWER	WISCONSIN POWER
CORPORATION	AND LIGHT COMPANY	AND LIGHT COMPANY
By: /s/ Lisa M. Barton	By: /s/ Lisa M. Barton	By: /s/ Lisa M. Barton
Lisa M. Barton	Lisa M. Barton	Lisa M. Barton
President and Chief Executive Officer	Chief Executive Officer	Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrants and in the capacities indicated on the 16th day of February 2024.

ALLIANT ENERGY	INTERSTATE POWER	WISCONSIN POWER
CORPORATION	AND LIGHT COMPANY	AND LIGHT COMPANY
/s/ Lisa M. Barton	/s/ Lisa M. Barton	/s/ Lisa M. Barton
Lisa M. Barton	Lisa M. Barton	Lisa M. Barton
President, Chief Executive Officer and Director (Principal Executive Officer)	Chief Executive Officer and Director (Principal Executive Officer)	Chief Executive Officer and Director (Principal Executive Officer)
/s/ Robert J. Durian	/s/ Robert J. Durian	/s/ Robert J. Durian
Robert J. Durian	Robert J. Durian	Robert J. Durian
Executive Vice President and Chief Financial Officer (Principal Financial Officer)	Executive Vice President and Chief Financial Officer (Principal Financial Officer)	Executive Vice President and Chief Financial Officer (Principal Financial Officer)
/s/ Benjamin M. Bilitz	/s/ Benjamin M. Bilitz	/s/ Benjamin M. Bilitz
Benjamin M. Bilitz	Benjamin M. Bilitz	Benjamin M. Bilitz
Chief Accounting Officer and Controller (Principal Accounting Officer)	Chief Accounting Officer and Controller (Principal Accounting Officer)	Chief Accounting Officer and Controller (Principal Accounting Officer)
/s/ John O. Larsen	/s/ John O. Larsen	/s/ John O. Larsen
John O. Larsen, Executive Chairman, Chairman of the Board and Director	John O. Larsen, Executive Chairman, Chairman of the Board and Director	John O. Larsen, Executive Chairman, Chairman of the Board and Director
/s/ Patrick E. Allen	/s/ Patrick E. Allen	/s/ Patrick E. Allen
Patrick E. Allen, Director	Patrick E. Allen, Director	Patrick E. Allen, Director
/s/ Ignacio A. Cortina	/s/ Ignacio A. Cortina	/s/ Ignacio A. Cortina
Ignacio A. Cortina, Director	Ignacio A. Cortina, Director	Ignacio A. Cortina, Director
/s/ Stephanie L. Cox	/s/ Stephanie L. Cox	/s/ Stephanie L. Cox
Stephanie L. Cox, Director	Stephanie L. Cox, Director	Stephanie L. Cox, Director
/s/ N. Joy Falotico	/s/ N. Joy Falotico	/s/ N. Joy Falotico
N. Joy Falotico, Director	N. Joy Falotico, Director	N. Joy Falotico, Director
/s/ Michael D. Garcia	/s/ Michael D. Garcia	/s/ Michael D. Garcia
Michael D. Garcia, Director	Michael D. Garcia, Director	Michael D. Garcia, Director
/s/ Roger K. Newport	/s/ Roger K. Newport	/s/ Roger K. Newport
Roger K. Newport, Director	Roger K. Newport, Director	Roger K. Newport, Director
/s/ Thomas F. O’Toole	/s/ Thomas F. O’Toole	/s/ Thomas F. O’Toole
Thomas F. O’Toole, Director	Thomas F. O’Toole, Director	Thomas F. O’Toole, Director
/s/ Carol P. Sanders	/s/ Carol P. Sanders	/s/ Carol P. Sanders
Carol P. Sanders, Director	Carol P. Sanders, Director	Carol P. Sanders, Director

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