01—Abstract
Summary
Summary of the 8-K filed September 11, 2025. Cited figures are marked; the original filing is the authoritative source.
On September 8, 2025, Interstate Power and Light Company ("IPL"), a subsidiary of Alliant Energy Corporation, entered into an Underwriting Agreement with KeyBanc Capital Markets Inc., PNC Capital Markets LLC, TD Securities (USA) LLC, and U.S. Bancorp Investments, Inc., as representatives of the underwriters, to sell $300 milliona aggregate principal amount of its 5.600% Senior Debentures due 2055 in a public offering.
The Debentures are issued under a 2003 Indenture with The Bank of New York Mellon Trust Company, N.A., as successor trustee, and are registered under an automatic shelf registration statement on Form S-3 filed December 15, 2023. The offering is expected to close on September 11, 2025, subject to customary closing conditions. IPL's press release dated September 8, 2025 states that the net proceeds are intended to reduce outstanding capital under its receivables purchase and sale program, reduce outstanding commercial paper, and/or fund general corporate purposes.
The debentures mature on October 1, 2055. The filing is made principally to file exhibits to the registration statement, including the Underwriting Agreement, the Officer's Certificate, and legal opinions from Perkins Coie LLP and Simmons Perrine Moyer Bergman PLC.
For investors, this filing documents a long-dated, fixed-rate debt issuance by a regulated utility subsidiary. The filing does not disclose any financial results, earnings impact, or changes to Alliant Energy's operations or guidance.
02—Key points
Key Highlights
- IPL priced a $300 million public offering of 5.600% Senior Debentures due October 1, 2055, on September 8, 2025.
- Underwriters for the offering are KeyBanc Capital Markets Inc., PNC Capital Markets LLC, TD Securities (USA) LLC, and U.S. Bancorp Investments, Inc., with Academy Securities, Inc. and Comerica Securities, Inc. as co-managers.
- Stated use of proceeds: reduce outstanding capital under IPL's receivables purchase and sale program, reduce outstanding commercial paper, and/or for general corporate purposes.
- The offering is expected to close on September 11, 2025, subject to customary closing conditions.
- The debentures were issued under an automatic shelf registration statement on Form S-3 (Registration No. 333-276062-01) filed December 15, 2023.
- The filing includes legal opinions from Perkins Coie LLP and Iowa counsel Simmons Perrine Moyer Bergman PLC regarding the legality of the debentures.
- The filing does not contain financial results or guidance changes; it is principally an exhibit filing for the debt offering.
03—Questions
Frequently Asked Questions
How much debt did Interstate Power and Light Company issue, and on what terms?
IPL agreed to sell $300 million aggregate principal amount of 5.600% Senior Debentures due October 1, 2055, in a public offering under an Underwriting Agreement dated September 8, 2025.
What will the proceeds be used for?
According to IPL's September 8, 2025 press release, net proceeds are intended to reduce outstanding capital under its receivables purchase and sale program, reduce outstanding commercial paper, and/or for general corporate purposes.
When is the offering expected to close?
The offering is expected to close on September 11, 2025, subject to standard closing conditions.
Under what registration was the offering made?
The debentures were registered under an automatic shelf registration statement on Form S-3 (Registration No. 333-276062-01) filed by IPL with the SEC on December 15, 2023, supplemented by a prospectus supplement filed September 10, 2025.
Does this filing report any change in Alliant Energy's financial results or outlook?
No. The filing is limited to the debt offering and its related exhibits and does not report financial results, earnings, or guidance.
04—Continue