Every 8-K that Alliant Energy Corporation (LNT) has filed with the SEC in the last 24 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 8-K covers material events a company has to report between its quarterly reports, so if you follow LNT and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full LNT filings page.
Alliant Energy Corporation (LNT) reported that its Iowa utility subsidiary, Interstate Power and Light Company (IPL), entered into an underwriting agreement to issue $500 million aggregate principal amount of 5.100% Senior Debentures due 2031 in a registered public offering. The debentures will be issued under IPL’s existing 2003 indenture with The Bank of New York Mellon Trust Company, N.A. as trustee, pursuant to an automatic shelf registration statement on Form S-3.
The debentures have a stated maturity of September 30, 2031, and the offering is expected to close on August 21, 2026, subject to customary closing conditions. IPL states that net proceeds are intended to be used to reduce outstanding capital under its receivables purchase and sale program, to reduce outstanding commercial paper, and/or for general corporate purposes. The deal is being underwritten by a syndicate led by Mizuho Securities USA LLC, PNC Capital Markets LLC, U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC as joint book-running managers.
Alliant Energy reported second quarter 2026 GAAP diluted EPS of $0.65, slightly below $0.68 a year earlier, on revenues of $971 million versus $961 million. Net income was $170 million compared with $174 million. Results were supported by higher revenue requirements from growing rate base at IPL and WPL, higher equity income and stronger temperature‑normalized electric and gas sales, partly offset by increased labor, maintenance, financing and depreciation costs and less favorable weather, which reduced operating income by $11 million.
For the first six months of 2026, GAAP diluted EPS was $1.52 versus $1.50, while ongoing (non‑GAAP) EPS was $1.47, excluding a $0.05 per‑share state tax apportionment benefit. Revenues for the period rose to $2.16 billion. The company reaffirmed 2026 ongoing EPS guidance of $3.36-$3.46 per share and indicated it is trending toward the upper half of that range. Management also highlighted expected 60% load growth by 2031 driven by large customers, alongside continued high capital spending and a shift toward more short‑term borrowings.
Alliant Energy Corporation reported the results of its annual meeting of shareowners held on May 20, 2026. All four director nominees — Patrick Allen, Manu Asthana, Ignacio Cortina, and Michael Garcia — were elected for terms ending in 2029, each receiving substantially more votes "for" than "against."
Shareowners also approved, on an advisory and non-binding basis, the compensation of the company’s named executive officers, with over 196 million votes in favor. In addition, the appointment of Deloitte & Touche LLP as independent registered public accounting firm for 2026 was ratified with more than 221 million votes in support.
Alliant Energy Corporation reported first quarter 2026 GAAP earnings per share of $0.87, up from $0.83 a year earlier. Ongoing EPS, which excludes a $0.05 per share state income tax apportionment benefit, was $0.82 versus $0.83 in 2025.
Total revenues rose to $1.184 billion from $1.128 billion, and net income attributable to common shareowners increased to $224 million from $213 million. Management reaffirmed 2026 consolidated ongoing EPS guidance of $3.36 to $3.46 per diluted share.
Results were driven by higher revenue requirements from increasing rate base at IPL and WPL, investments in generation and energy storage, and higher allowance for funds used during construction, partly offset by higher financing, depreciation, and maintenance expenses and cooler- or warmer-than-normal temperatures, which reduced operating income by an estimated $16 million. Alliant also highlighted data center growth, including a new approximately 370 MW electric service agreement in Iowa.
Alliant Energy Corporation entered into a new equity distribution agreement that allows it to sell, from time to time, shares of common stock with an aggregate offering price of up to $1,000,000,000. Sales may be made through multiple banks acting as agents on the Nasdaq Global Select Market or directly to an agent acting as principal.
The company may also use forward sale arrangements, where forward purchasers borrow and sell shares now and Alliant Energy receives cash later upon physical settlement of each forward confirmation. Net proceeds are intended for general corporate purposes, including debt repayment, working capital and construction or acquisition spending.
Alliant Energy Corporation entered into a new term loan credit agreement providing a $400 million term loan facility, with an additional incremental term loan capacity of up to $100 million in lender discretion. The company can use the borrowings for general corporate purposes, including working capital, capital spending, and refinancing existing debt.
The credit facility matures on March 1, 2027 and includes a covenant requiring a consolidated debt-to-capital ratio not greater than 65%. It also limits liens on company and subsidiary assets, subject to defined exceptions, and includes customary events of default and a cross-default trigger tied to at least $100 million of other debt.
Alliant Energy Corporation reported stronger 2025 results, with GAAP diluted earnings per share of $3.14, up from $2.69 in 2024. Ongoing (non-GAAP) EPS rose to $3.22 from $3.04, reflecting about 6% earnings growth driven mainly by higher revenue requirements from authorized rate base increases and continued capital investment.
The company affirmed its 2026 ongoing EPS guidance range of $3.36 to $3.46. Management outlined an updated 2026-2029 capital plan, projecting annual capital expenditures between $3,130 million and $3,625 million from 2026 through 2028, focused on renewables, energy storage, gas projects and electric and gas distribution systems.
Alliant Energy Corporation and its utility subsidiaries are expanding their boards and adding a new independent director. On January 5, 2026, the boards of Alliant Energy, Interstate Power and Light Company, and Wisconsin Power and Light Company increased their board size to 11 members and appointed Manu Asthana as a director effective February 23, 2026.
Asthana, 52, previously served as President and Chief Executive Officer of PJM Interconnection from 2020 to 2025, an organization that oversees the largest power grid in North America, serving 67 million people across 13 states and the District of Columbia. He will stand for election at Alliant Energy’s 2026 Annual Meeting of Shareowners as a nominee to serve until the 2029 Annual Meeting, alongside three directors whose terms expire in 2026.
Effective February 23, 2026, he will join the Audit Committee and Operations Committee of each board. For 2026 board service, he will receive non-employee director compensation in line with existing practices, with an annual retainer of $300,000 for service on all three boards.
Alliant Energy Corporation announced a leadership transition at its Wisconsin Power and Light Company (WPL) subsidiary. After 39 years with the organization, David A. de Leon, President of WPL and Senior Vice President of Alliant Energy and Interstate Power and Light Company (IPL), has informed the company that he intends to retire from all his positions. Effective January 5, 2026, he will step down as President of WPL but continue as Senior Vice President of Alliant Energy, IPL and WPL until his retirement on or about July 1, 2026.
Effective January 5, 2026, the Board of Directors of WPL appointed Rebecca Cameron Valcq as President of WPL. She will also serve as Vice President of Alliant Energy and IPL. Valcq, 50, has been Assistant Vice President of the company since 2024 and previously chaired the Public Service Commission of Wisconsin from 2019 to 2024, overseeing regulation of more than 1,000 utilities and leading the state’s Energy, Broadband and Energy Innovation offices.
Wisconsin Power and Light Company, a subsidiary of Alliant Energy Corporation, agreed to sell $300,000,000 of 5.700% Debentures due 2055 in a public offering. The debentures are being sold to a group of underwriters led by Mizuho Securities USA, Wells Fargo Securities, BofA Securities and MUFG Securities Americas under an underwriting agreement signed on December 2, 2025.
The debentures are issued under an existing indenture with U.S. Bank Trust Company and are registered on an automatic shelf registration statement on Form S-3, supported by a prospectus supplement filed on December 2, 2025. The offering is expected to close on December 5, 2025, subject to standard closing conditions. WPL also filed related exhibits, including the underwriting agreement, the officers’ certificate defining the debenture terms, a legal opinion from Perkins Coie LLP on the validity of the debentures, and a press release announcing that the offering was priced.
Alliant Energy Corporation filed a Form 8-K to report quarterly results. On November 6, 2025, the company announced financial results for the three and nine months ended September 30, 2025, and furnished the related press release as Exhibit 99.1.
This is a combined filing for Alliant Energy Corporation, Interstate Power & Light Company, and Wisconsin Power & Light Company. The 8-K lists Item 2.02 (Results of Operations and Financial Condition) and includes the press release under Item 9.01(d).
Alliant Energy Corporation entered into an underwriting agreement to sell $725 million aggregate principal amount of 5.750% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2056 in a public offering.
The Notes will be issued under an Indenture with The Bank of New York Mellon Trust Company, N.A., were registered on a Form S-3 shelf registration (No. 333-276062) and described in a prospectus supplement filed September 25, 2025. The underwriting agreement and related indentures and legal and tax opinions are filed as exhibits to this Current Report.