Alliant Energy Corp Contracts & Agreements

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of September 6, 2024 ________________________________ Setting Forth Terms of Two Series of Debt Securities 4.950%... (Filed With SEC on September 6, 2024)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 4.950% SENIOR DEBENTURES DUE 2034 5.450% SENIOR DEBENTURES DUE 2054 UNDERWRITING AGREEMENT Dated: September 4, 2024 TABLE... (Filed With SEC on September 6, 2024)

INDENTURE Dated as of June 6, 2024 Among ALLIANT ENERGY FINANCE, LLC, as Issuer, ALLIANT ENERGY CORPORATION, as Guarantor and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as... (Filed With SEC on June 6, 2024)

AMENDED AND RESTATED CREDIT AGREEMENT DATED AS OF MARCH 1, 2024 AMONG ALLIANT ENERGY FINANCE, LLC, AS THE BORROWER, ALLIANT ENERGY CORPORATION, AS THE GUARANTOR, THE LENDERS, AND... (Filed With SEC on March 5, 2024)

INDENTURE Dated as of November10, 2023 Among ALLIANT ENERGY FINANCE, LLC, as Issuer, ALLIANT ENERGY CORPORATION, as Guarantor and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,... (Filed With SEC on November 13, 2023)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 5.700% SENIOR DEBENTURES DUE 2033 UNDERWRITING AGREEMENT Dated: September 18, 2023 TABLE OF CONTENTS (Filed With SEC on September 21, 2023)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of September 21, 2023 ________________________________ Setting Forth Terms of a Series of Debt Securities 5.700%... (Filed With SEC on September 21, 2023)

ALLIANT ENERGY CORPORATION AND THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., as Trustee INDENTURE Dated as of March 2, 2023 3.875% Convertible Senior Notes due 2026 TABLE OF... (Filed With SEC on March 3, 2023)

Distribution Agreement, dated December 14, 2022, among Alliant Energy Corporation, Barclays Capital Inc., Mizuho Securities USA LLC and Wells Fargo Securities, LLC (Filed With SEC on December 15, 2022)

CREDIT AGREEMENT DATED AS OF MARCH 3, 2022 AMONG ALLIANT ENERGY FINANCE, LLC, AS THE BORROWER, ALLIANT ENERGY CORPORATION, AS THE GUARANTOR, THE LENDERS, AND U.S. BANK NATIONAL... (Filed With SEC on March 4, 2022)

INDENTURE Dated as of February28, 2022 Among ALLIANT ENERGY FINANCE, LLC, as Issuer, ALLIANT ENERGY CORPORATION, as Guarantor and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,... (Filed With SEC on March 1, 2022)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 3.100% SENIOR DEBENTURES DUE 2051 UNDERWRITING AGREEMENT Dated: November16, 2021 TABLE OF CONTENTS (Filed With SEC on November 19, 2021)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of November 19, 2021 Setting Forth Terms of a Series of Debt Securities 3.100% Senior Debentures due 2051 Pursuant... (Filed With SEC on November 19, 2021)

KEY EXECUTIVE EMPLOYMENT AND SEVERANCE AGREEMENT [TIER ONE] (Filed With SEC on October 28, 2021)

KEY EXECUTIVE EMPLOYMENT AND SEVERANCE AGREEMENT [TIER TWO] (Filed With SEC on October 28, 2021)

INDENTURE Dated as of November20, 2020 Among ALLIANT ENERGY FINANCE, LLC, as Issuer, ALLIANT ENERGY CORPORATION, as Guarantor and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,... (Filed With SEC on November 23, 2020)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of June 2, 2020 Setting Forth Terms of a Series of Debt Securities 2.300% Senior Debentures due 2030 Pursuant to... (Filed With SEC on June 2, 2020)

========================================================================================== INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 2.300% SENIOR DEBENTURES DUE... (Filed With SEC on June 2, 2020)

Wisconsin Power and Light Company OFFICERS CERTIFICATE Dated as of April 2, 2020 Setting Forth Terms of a Series of Debt Securities 3.650% Debentures due 2050 Pursuant to the... (Filed With SEC on April 2, 2020)

========================================================================================== WISCONSIN POWER AND LIGHT COMPANY (a Wisconsin corporation) 3.650% DEBENTURES DUE 2050... (Filed With SEC on April 2, 2020)

Exhibit 10.1, which is incorporated by reference herein.Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a... (Filed With SEC on March 5, 2020)

To:Alliant Energy Corporation4902 N. Biltmore LaneMadison, WI 53718From:Barclays Bank PLC 5 The North Colonnade Canary Wharf, London E14 4BB Facsimile: +44 (20) 777 36461... (Filed With SEC on November 18, 2019)

Alliant Energy Corporation Common Stock Underwriting Agreement (Filed With SEC on November 18, 2019)

Officers Certificate creating the 3.000% Debentures due 2029 of Wisconsin Power and Light Company (Filed With SEC on June 24, 2019)

Underwriting Agreement, dated June 17, 2019, among Wisconsin Power and Light Company and the underwriters named therein (Filed With SEC on June 24, 2019)

Underwriting Agreement dated as of December 13, 2018 (Filed With SEC on December 17, 2018)

Forward Sale Agreement between Alliant Energy and Goldman Sachs & Co. LLC dated as of December 13, 2018 (Filed With SEC on December 17, 2018)

Forward Sale Agreement between Alliant Energy and Bank of America, N.A. dated as of December 13, 2018 (Filed With SEC on December 17, 2018)

Additional Forward Sale Agreement between Alliant Energy and Goldman Sachs & Co. LLC dated as of December 14, 2018 (Filed With SEC on December 17, 2018)

Additional Forward Sale Agreement between Alliant Energy and Bank of America, N.A. dated as of December 14, 2018 (Filed With SEC on December 17, 2018)

Officers Certificate creating the 4.100% Senior Debentures due 2028 of Interstate Power and Light Company (Filed With SEC on September 26, 2018)

Underwriting Agreement, dated September 19, 2018, among Interstate Power and Light Company and the underwriters named therein (Filed With SEC on September 26, 2018)

Indenture, dated as of June 12, 2018, among Alliant Energy Finance, LLC, Alliant Energy Corporation, as guarantor, and The Bank of New York Mellon Trust Company, N.A., as trustee (Filed With SEC on June 12, 2018)

Distribution Agreement, dated May 18, 2018, among Alliant Energy Corporation, Barclays Capital Inc., BNY Mellon Capital Markets, LLC and J.P. Morgan Securities LLC (Filed With SEC on May 21, 2018)

Term Loan Credit Agreement, dated as of April 26, 2018, among Alliant Energy Finance, LLC, Alliant Energy Corporation, U.S. Bank National Association and the lender parties set... (Filed With SEC on April 30, 2018)

Underwriting Agreement, dated November 9, 2017, among Interstate Power and Light Company and the underwriters named therein (Filed With SEC on November 15, 2017)

Officers Certificate creating the 3.25% Senior Debentures due 2024 of Interstate Power and Light Company (Filed With SEC on November 15, 2017)

DISTRIBUTION AGREEMENT (Filed With SEC on May 9, 2017)

$500,000,000 TERM LOAN CREDIT AGREEMENT dated as of October 7, 2016 among ALLIANT ENERGY FINANCE, LLC, as Borrower ALLIANT ENERGY CORPORATION, as Guarantor THE BANKS NAMED HEREIN,... (Filed With SEC on October 7, 2016)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 3.70%SENIOR DEBENTURES DUE 2046 UNDERWRITING AGREEMENT Dated: September 12, 2016 TABLE OF CONTENTS (Filed With SEC on September 15, 2016)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of September 15, 2016 Setting ForthTerms of a Series of Debt Securities 3.70% Senior Debentures due 2046 Pursuant... (Filed With SEC on September 15, 2016)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 3.400%SENIOR DEBENTURES DUE 2025 UNDERWRITING AGREEMENT Dated: August 13, 2015 TABLE OF CONTENTS (Filed With SEC on August 18, 2015)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of August 18, 2015 Setting ForthTerms of a Series of Debt Securities 3.400% Senior Debentures due 2025 Pursuant to... (Filed With SEC on August 18, 2015)

DISTRIBUTION AGREEMENT (Filed With SEC on March 4, 2015)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 3.25%SENIOR DEBENTURES DUE 2024 UNDERWRITING AGREEMENT Dated: November 17, 2014 TABLE OF CONTENTS (Filed With SEC on November 24, 2014)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of November 24, 2014 Setting ForthTerms of a Series of Debt Securities 3.25% Senior Debentures due 2024 Pursuant... (Filed With SEC on November 24, 2014)

$250,000,000 TERM LOAN CREDIT AGREEMENT Dated as of October 7, 2014 Among ALLIANT ENERGYCORPORATION as Borrower THE BANKS NAMED HEREIN as Banks and WELLS FARGO BANK, NATIONAL... (Filed With SEC on October 14, 2014)

AMENDMENT TO THE ALLIANT ENERGY DEFINED CONTRIBUTION SUPPLEMENTAL RETIREMENT PLAN (Filed With SEC on March 12, 2014)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of October 8, 2013 Setting ForthTerms of a Series of Debt Securities 4.70% Senior Debentures due 2043 Pursuant to... (Filed With SEC on October 8, 2013)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 4.700%SENIOR DEBENTURES DUE 2043 UNDERWRITING AGREEMENT Dated: October 3, 2013 TABLE OF CONTENTS (Filed With SEC on October 8, 2013)

AMENDMENT TO THE ALLIANT ENERGY CORPORATION 2010 OMNIBUS INCENTIVE PLAN (Filed With SEC on December 5, 2011)

FORM OF AMENDMENT NUMBER ONE TO KEY EXECUTIVE EMPLOYMENT AND SEVERANCE AGREEMENT (Filed With SEC on December 5, 2011)

AMENDMENT TO THE ALLIANT ENERGY CORPORATION SEVERANCE PLAN (Filed With SEC on December 5, 2011)

AMENDMENT TO THE AMENDED AND RESTATED ALLIANT ENERGY EXCESS RETIREMENT PLAN (Filed With SEC on December 5, 2011)

AMENDMENT TO THE ALLIANT ENERGY DEFINED CONTRIBUTION SUPPLEMENTAL RETIREMENT PLAN (Filed With SEC on December 5, 2011)

AMENDMENT TO THE AMENDED AND RESTATED ALLIANT ENERGY DEFERRED COMPENSATION PLAN (Filed With SEC on December 5, 2011)

ALLIANT ENERGY DEFERRED COMPENSATION PLAN (As Amended and RestatedEffective January 1, 2011) Table of Contents (Filed With SEC on December 14, 2010)

INTERSTATE POWER AND LIGHT COMPANY OFFICERS CERTIFICATE Dated as of August 23, 2010 Setting ForthTerms of a Series of Debt Securities 3.65% Senior Debentures due 2020 Pursuant to... (Filed With SEC on August 24, 2010)

INTERSTATE POWER AND LIGHT COMPANY (an Iowa corporation) 3.65% SENIOR DEBENTURES DUE 2020 PURCHASE AGREEMENT Dated: August 23, 2010 TABLE OF CONTENTS (Filed With SEC on August 24, 2010)

(a Wisconsin corporation) 4.00% SENIOR NOTES DUE 2014 UNDERWRITING AGREEMENT Dated: September 30, 2009 (Filed With SEC on October 1, 2009)

OFFICERS CERTIFICATE Dated as of September 30, 2009 (Filed With SEC on October 1, 2009)

SIXTH SUPPLEMENTAL INDENTURE (Filed With SEC on September 29, 2009)

Five Year Credit Agreement (Filed With SEC on July 29, 2004)

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Alliant Energy Corp Contracts & Agreements