Interstate Power and Light Company Prices Debt Offering

MADISON, Wis. ~ Interstate Power and Light Company (IPL), a wholly owned subsidiary of Alliant Energy Corporation (NASDAQ: LNT), has announced the pricing of its public offering of $300 million aggregate principal amount of 5.700% senior debentures. The senior debentures will be due on October 15, 2033, and the closing of the offering is expected to occur on September 21, 2023, subject to the satisfaction of customary closing conditions.

IPL intends to use the net proceeds from this offering to reduce outstanding capital under its receivables purchase and sale program, to reduce commercial paper classified as long-term debt, and/or for general corporate purposes. The offering was marketed through a group of underwriters consisting of BofA Securities, Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., U.S. Bancorp Investments, Inc., and Wells Fargo Securities, LLC, as joint book-running managers, and Siebert Williams Shank & Co. LLC and TD Securities (USA) LLC as co-managers.

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The prospectus supplement and accompanying prospectus which are part of a shelf registration statement IPL filed with the Securities and Exchange Commission (the "Commission") can be obtained by calling BofA Securities, Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., U.S. Bancorp Investments, Inc., or Wells Fargo Securities, LLC toll free at their respective numbers provided in the press release. Electronic copies are also 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.

Alliant Energy Corporation's Iowa utility subsidiary is based in Cedar Rapids and utilizes the trade name Alliant Energy (NASDAQ:LNT). Interstate Power and Light Company is committed to providing reliable energy services for its customers while also striving for environmental sustainability through renewable energy sources such as wind power generation facilities located throughout Iowa.

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