Alliant Energy Sells Interstate Gas Pipeline Business

TL;DR

Alliant Energy is selling its gas pipeline business, focusing on renewables and core utilities.

AI Summary

Alliant Energy Corp. announced on September 23, 2025, that it has entered into a definitive agreement to sell its approximately 1,600-mile regulated interstate natural gas pipeline business to an undisclosed buyer. The transaction is expected to close in the first quarter of 2026, subject to regulatory approvals. This divestiture aligns with Alliant Energy's strategy to focus on its regulated utility operations and renewable energy growth.

Why It Matters

This sale allows Alliant Energy to streamline its operations and concentrate on its core utility businesses and renewable energy investments, potentially impacting its future growth strategy and capital allocation.

Risk Assessment

Risk Level: medium — The sale is subject to regulatory approvals and closing conditions, introducing uncertainty until completion.

Key Numbers

• 1,600 miles — Pipeline Business Size (Represents the scale of the regulated interstate natural gas pipeline assets being divested.)

Key Players & Entities

• Alliant Energy Corp. (company) — Registrant and seller of the pipeline business
• September 23, 2025 (date) — Date of the agreement to sell the pipeline business
• first quarter of 2026 (date) — Expected closing period for the transaction
• 1,600-mile (length) — Size of the regulated interstate natural gas pipeline business being sold

FAQ

Key Financial Figures

• $0.01 — liant Energy Corporation, Common Stock, $0.01 Par Value LNT Nasdaq Global Select Mar
• $725 million — terms and conditions set forth therein, $725 million in aggregate principal amount of the Co

Filing Documents

• lnt-20250923.htm (8-K) — 33KB
• lnt092320258-kex11.htm (EX-1.1) — 279KB
• lnt092320258-kex41.htm (EX-4.1) — 718KB
• lnt092320258-kex42.htm (EX-4.2) — 183KB
• lnt092320258-kex51.htm (EX-5.1) — 18KB
• lnt092320258-kex81.htm (EX-8.1) — 16KB
• lnt092320258-kex991.htm (EX-99.1) — 7KB
• exhibit9911aa.jpg (GRAPHIC) — 18KB
• headera.jpg (GRAPHIC) — 3KB
• headerb.jpg (GRAPHIC) — 3KB
• 0000352541-25-000076.txt ( ) — 1641KB
• lnt-20250923.xsd (EX-101.SCH) — 2KB
• lnt-20250923_def.xml (EX-101.DEF) — 14KB
• lnt-20250923_lab.xml (EX-101.LAB) — 25KB
• lnt-20250923_pre.xml (EX-101.PRE) — 15KB
• lnt-20250923_htm.xml (XML) — 3KB

01 Other Events

Item 8.01 Other Events. On September 23, 2025, Alliant Energy Corporation (the "Company") entered into an Underwriting Agreement (the "Underwriting Agreement") with BofA Securities, Inc., MUFG Securities Americas Inc., Barclays Capital Inc., Goldman Sachs & Co. LLC, and J.P. Morgan Securities LLC, as representatives of the several underwriters listed therein (the "Underwriters"), pursuant to which the Company agreed to sell, and the Underwriters agreed to purchase, subject to the terms and conditions set forth therein, $725 million in aggregate principal amount of the Company's 5.750% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2056 (the "Notes"), in a public offering (the "Offering"). The Notes are to be issued under an Indenture dated as of September 26, 2025, between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee (the "Indenture"), pursuant to a First Supplemental Indenture, dated September 26, 2025, between the Company and the Trustee (the "Supplemental Indenture"). The Notes are registered under the Securities Act of 1933, as amended, pursuant to an automatic shelf registration statement on Form S-3 (Registration No. 333-276062) that the Company filed with the Securities and Exchange Commission (the "SEC") on December 15, 2023, and amended on September 22, 2025 (the "Registration Statement"). The Registration Statement was supplemented by a prospectus supplement setting forth the terms of the Notes that the Company filed with the SEC on September 25, 2025 (the "Prospectus Supplement"). This Current Report on Form 8-K is being filed for the purpose of filing exhibits to the Registration Statement relating to the public offering of the Notes, and all such exhibits are hereby incorporated into the Registration Statement by reference. The Underwriting Agreement is filed as Exhibit 1.1, the Indenture is filed as Exhibit 4.1, and the Supplemental Indenture is filed as Exhibit 4.2 to this Form 8-K. On September 23, 2025,

01 Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits. (d) Exhibits . The following exhibits are being filed herewith: Exhibit No. Description 1.1 Underwriting Agreement, dated September 23 , 2025, among Alliant Energy Corporation and the underwriters named therein. 4.1 Indenture, dated as of September 26 , 2025, between Alliant Energy Corporation and The Bank of New York Mellon Trust Company, N.A., as trustee. 4.2 First Supplemental Indenture, dated as of September 26 , 2025, between Alliant Energy Corporation and The Bank of New York Mellon Trust Company, N.A., as trustee, relating to the 5.750 % Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2056 (including the form of the Notes). 5.1 Opinion of Perkins Coie LLP . 8.1 Tax Opinion of Perkins Coie LLP. 23.1 Consent of Perkins Coie LLP (contained in Exhibit 5.1 hereto). 23.2 Consent of Perkins Coie LLP (contained in Exhibit 8.1 hereto). 99.1 Press Release of Alliant Energy Corporation , dated September 23 , 2025. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ALLIANT ENERGY CORPORATION Date: September 26, 2025 By: /s/ Robert J. Durian Name: Robert J. Durian Title: Executive Vice President and Chief Financial Officer

View Full Filing

View this 8-K filing on SEC EDGAR