Alliant Energy 8-K Report, Material Agreement (Oct 28, 2026)

On October 26, 2026, Wisconsin Power and Light Company (WPL) and Interstate Power and Light Company (IPL), both wholly owned subsidiaries of Alliant Energy Corporation, entered into loan guarantee agreements, note purchase agreements, and future advance promissory notes with the U.S. Department of Energy under the DOE Loan Guarantee Program established under Title XVII of the Energy Policy Act of 2005.

The filing states that Alliant Energy Corporation is not a party to, and has no direct obligations under, these Loan Documents, and that each subsidiary has no obligations under the other's documents. Under the facilities, WPL may borrow up to $1,626,488,000 and IPL up to $3,500,000,000^a through the Federal Financing Bank to reimburse up to 80% of eligible project costs for projects such as generation, transmission, substations, energy storage and grid resilience technologies. Borrowings are full recourse, senior unsecured obligations of each subsidiary, with a scheduled final maturity of May 15, 2056.

Each advance bears interest at a U.S. Treasury rate plus 37.5 basis points, and the availability period runs until the earliest of September 15, 2033, the maximum loan amount being reached, or termination. The agreements contain customary covenants and events of default, including compliance with DOE Program Requirements, and mandatory prepayment provisions tied to eligible project status, a 95%^b regulatory cost recovery threshold, and changes in control (35% or more beneficial ownership of the borrower). The filing also notes that advances are conditioned on items such as completion of DOE environmental review, receipt of state regulatory approvals, and confirmation of investment grade credit ratings.