01—Abstract
Summary
Summary of the 8-K filed December 5, 2025. Cited figures are marked; the original filing is the authoritative source.
Wisconsin Power and Light Company (WPL), a subsidiary of Alliant Energy Corporation (NASDAQ: LNT), entered into an Underwriting Agreement dated December 2, 2025 with Mizuho Securities USA LLC, Wells Fargo Securities, LLC, BofA Securities, Inc. and MUFG Securities Americas Inc., as representatives of the underwriters, to sell $300,000,000a aggregate principal amount of its 5.700% Debentures due 2055 in a public offering.
The Offering is expected to close on December 5, 2025, subject to standard closing conditions. The Debentures are being issued under a 1997 Indenture with U.S. Bank Trust Company, National Association, as successor trustee, and are registered under an automatic shelf registration statement on Form S-3 filed December 15, 2023. The company priced the offering on December 2, 2025, and its press release states the debentures will be due December 15, 2055.
WPL intends to use the net proceeds to reduce its outstanding commercial paper and for general corporate purposes. This 8-K is filed chiefly to file exhibits to the registration statement, including the Underwriting Agreement, the Officers' Certificate, and a Perkins Coie LLP legality opinion dated December 5, 2025. For investors, the filing is a debt financing event that refinances short-term commercial paper with long-term fixed-rate debt at the subsidiary level.
02—Key points
Key Highlights
- WPL priced a $300 million public offering of 5.700% Debentures due 2055 on December 2, 2025.
- Closing is expected on December 5, 2025, subject to customary closing conditions.
- Net proceeds are intended to reduce outstanding commercial paper and fund general corporate purposes.
- The Debentures were issued under a 1997 Indenture with U.S. Bank Trust Company, National Association, as successor trustee.
- The offering is registered under an automatic shelf registration statement on Form S-3 filed December 15, 2023.
- Underwriters include Mizuho Securities USA LLC, Wells Fargo Securities, LLC, BofA Securities, Inc. and MUFG Securities Americas Inc. as representatives; Academy Securities, PNC Capital Markets and U.S. Bancorp Investments were co-managers.
- Perkins Coie LLP issued a legality opinion dated December 5, 2025.
03—Questions
Frequently Asked Questions
How much debt is WPL issuing and on what terms?
WPL is selling $300,000,000 aggregate principal amount of 5.700% Debentures due December 15, 2055, in a public offering priced December 2, 2025.
What will the proceeds be used for?
WPL intends to use the net proceeds to reduce its outstanding commercial paper and for general corporate purposes, according to its December 2, 2025 press release.
When is the offering expected to close?
The offering is expected to close on December 5, 2025, subject to standard closing conditions.
Under what registration is the offering being made?
The Debentures are registered under an automatic shelf registration statement on Form S-3 (Registration No. 333-276062-02) filed with the SEC on December 15, 2023, supplemented by a prospectus supplement filed December 2, 2025.
Why was this 8-K filed?
The 8-K was filed to file exhibits to the registration statement relating to the Debentures offering, including the Underwriting Agreement, Officers' Certificate, legality opinion, and the pricing press release, all incorporated into the registration statement by reference.
04—Continue