Alliant Energy unit prices $500M 2031 debentures
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Rhea-AI Filing Summary
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.
8-K Event Classification
Key Figures
Key Terms
senior debentures financial
automatic shelf registration statement regulatory
prospectus supplement regulatory
receivables purchase and sale program financial
indenture financial
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What debt offering did Alliant Energy’s subsidiary IPL announce in this Form 8-K for LNT?
What is the interest rate and maturity date of IPL’s new debentures mentioned for LNT?
When is the closing of IPL’s $500 million debenture offering for Alliant Energy (LNT) expected?
How does IPL plan to use the net proceeds of the $500 million debenture offering for LNT?
Under what registration statement is IPL’s $500 million debenture offering for LNT being made?
AI-generated analysis. How Rhea-AI works. Not financial advice.
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |
Title of Each Class |
Trading Symbol |
Name of Each Exchange on Which Registered | ||
Alliant Energy Corporation |
| Item 8.01 | Other Events. |
On August 18, 2026, Interstate Power and Light Company (“IPL”), a subsidiary of Alliant Energy Corporation, entered into an Underwriting Agreement (the “Underwriting Agreement”) with Mizuho Securities USA LLC, PNC Capital Markets LLC, U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC, as representatives of the several underwriters listed therein (the “Underwriters”), pursuant to which IPL agreed to sell, and the Underwriters agreed to purchase, subject to the terms and conditions set forth therein, $500 million aggregate principal amount of IPL’s 5.100% Senior Debentures due 2031 (the “Debentures”), in a public offering (the “Offering”). The Debentures are to be issued under an Indenture dated as of August 20, 2003, between IPL and The Bank of New York Mellon Trust Company, N.A., as successor trustee (the “Indenture”), pursuant to an Officer’s Certificate provided pursuant to the Indenture setting forth the terms of the Debentures, dated as of August 21, 2026 (the “Certificate”). The Offering is expected to close, subject to standard closing conditions, on August 21, 2026.
The Debentures are registered under the Securities Act of 1933, as amended, pursuant to an automatic shelf registration statement on Form S-3 (Registration No. 333-276062-01) that IPL filed with the Securities and Exchange Commission (the “SEC”) on December 15, 2023 (the “Registration Statement”). The Registration Statement was supplemented by a Prospectus Supplement setting forth the terms of the Debentures that IPL filed with the SEC on August 18, 2026.
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 Debentures, and all such exhibits are hereby incorporated into the Registration Statement by reference. The Underwriting Agreement is filed as Exhibit 1.1 and the Certificate is filed as Exhibit 4.1 to this Form 8-K.
On August 18, 2026, IPL issued a press release announcing that it had priced the Offering. The press release is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.
Ashurst Perkins Coie US LLP, counsel to IPL, has issued an opinion to IPL, dated August 21, 2026, regarding the legality of the Debentures upon issuance thereof, and Simmons Perrine PLC, Iowa counsel to IPL, has issued an opinion to IPL, dated August 21, 2026, regarding certain legal matters relating to Iowa law. The opinions are filed as Exhibit 5.1 and Exhibit 5.2, respectively, hereto.
| Item 9.01 | Financial Statements and Exhibits. |
| (d) | Exhibits |
| Exhibit No. | Description | |
| 1.1 | Underwriting Agreement, dated August 18, 2026, among Interstate Power and Light Company and the underwriters named therein. | |
| 4.1 | Officer’s Certificate, dated August 21, 2026, creating the 5.100% Senior Debentures due 2031 of Interstate Power and Light Company. | |
| 5.1 | Opinion of Ashurst Perkins Coie US LLP, dated August 21, 2026, with respect to the 5.100% Senior Debentures due 2031 of Interstate Power and Light Company. | |
| 5.2 | Opinion of Simmons Perrine PLC, dated August 21, 2026, with respect to the 5.100% Senior Debentures due 2031 of Interstate Power and Light Company. | |
| 23.1 | Consent of Ashurst Perkins Coie US LLP (contained in Exhibit 5.1 hereto). | |
| 23.2 | Consent of Simmons Perrine PLC (contained in Exhibit 5.2 hereto). | |
| 99.1 | Press Release of Interstate Power and Light Company, dated August 18, 2026. | |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). | |
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, Alliant Energy Corporation and Interstate Power and Light Company have each duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
| ALLIANT ENERGY CORPORATION | ||||||
| Date: August 21, 2026 |
By: | /s/ Robert J. Durian | ||||
| Robert J. Durian | ||||||
| Executive Vice President and Chief Financial Officer | ||||||
| INTERSTATE POWER AND LIGHT COMPANY | ||||||
| Date: August 21, 2026 |
By: | /s/ Robert J. Durian | ||||
| Robert J. Durian | ||||||
| Executive Vice President and Chief Financial Officer | ||||||
Exhibit 99.1
| Interstate Power and Light Company | ||||
| An Alliant Energy Company | ||||
| Corporate Headquarters 4902 North Biltmore Lane Madison, WI 53718-2148 | ||||
| News Release | ||||
| FOR IMMEDIATE RELEASE | Media Hotline: (608) 458-4040 | |||
| Investor Relations: Susan Gille: (608) 458-3956 | ||||
Interstate Power and Light Company Prices Debt Offering
$500 million in senior debentures will be due in 2031
Madison, Wisconsin – August 18, 2026 – Interstate Power and Light Company (“IPL”), a wholly owned subsidiary of Alliant Energy Corporation (NASDAQ: LNT), announced the pricing of its public offering of $500 million aggregate principal amount of 5.100% senior debentures due 2031. The senior debentures will be due on September 30, 2031. IPL intends to use the net proceeds from this offering to reduce outstanding capital under its receivables purchase and sale program, to reduce outstanding commercial paper, and/or for general corporate purposes. The closing of the offering is expected to occur on August 21, 2026, subject to the satisfaction of customary closing conditions.
The offering was marketed through a group of underwriters consisting of Mizuho Securities USA LLC, PNC Capital Markets LLC, U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC as joint book-running managers, and Academy Securities, Inc., Fifth Third Securities, Inc., KeyBanc Capital Markets Inc. and TD Securities (USA) LLC as co-managers.
The offering is being made only by means of a prospectus supplement and accompanying prospectus which are part of a shelf registration statement IPL filed with the Securities and Exchange Commission (the “Commission”). Copies may be obtained by calling Mizuho Securities USA LLC toll free at 1-866-271-7403, PNC Capital Markets LLC toll free at 1-855-881-0697, U.S. Bancorp Investments, Inc. toll free at 1-877-558-2607 and Wells Fargo Securities, LLC toll free at 1-800-645-3751. Electronic copies of these documents will be available from the Commission’s website at www.sec.gov.
This press release does not constitute an offer to sell or the solicitation of an offer to buy these securities, nor will there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.
About Alliant Energy
Alliant Energy Corporation’s Iowa utility subsidiary, Interstate Power and Light Company (IPL), utilizes the trade name of Alliant Energy (NASDAQ:LNT). The Iowa utility is based in Cedar Rapids, Iowa.
Forward-Looking Statements
This press release includes forward-looking statements. These statements involve inherent risks and uncertainties that could cause actual results to differ materially from those projected or anticipated, including risks related to the proposed offering, the anticipated use of proceeds from the sale of the senior debentures and other risks outlined in IPL’s public filings with the Commission, including IPL’s most recent annual report on Form 10-K and subsequent Quarterly Reports on Form 10-Q. All information provided in this news release speaks as of the date hereof. Except as otherwise required by law, IPL undertakes no obligation to update or revise its forward-looking statements.