Item 8.01 Other Events.

On November 3, 2021, Interstate Power and Light Company ("IPL"), a wholly owned subsidiary of Alliant Energy Corporation (NASDAQ: LNT), issued a notice of redemption for all of the 8,000,000 outstanding shares of IPL's 5.100% Series D Cumulative Perpetual Preferred Stock, $0.01 par value, which is listed on the Nasdaq Global Select Market under the symbol IPLDP (the "Series D Preferred Stock"). The redemption will be effective on December 15, 2021 (the "Redemption Date"). The redemption price will be $25 per share, which is equal to $25 per share plus accrued and unpaid dividends to, but excluding, the Redemption Date (the "Redemption Price").

The total amount being paid by IPL to effect the redemption is approximately $200 million. The Redemption Price does not include the quarterly dividend that is scheduled to be paid on December 15, 2021 to applicable holders of record.

All of the Series D Preferred Stock are held in book-entry form through the Depository Trust Company ("DTC") and will be redeemed in accordance with the procedures of DTC. On the Redemption Date, all of the Series D Preferred Stock remaining issued and outstanding as of such date will be redeemed and holders of Series D Preferred Stock will be entitled to receive the Redemption Price for such shares.

IPL will deposit the aggregate Redemption Price for all of the Series D Preferred Stock with EQ Shareowner Services (the "Redemption and Paying Agent"), as redemption agent. Payment to DTC for the Series D Preferred Stock will be made by the Redemption and Paying Agent. The address for the Redemption and Paying Agent is as follows:



EQ Shareowner Services
1110 Centre Pointe Curve Suite 101
Mendota Heights, MN 55120
Attn: Corporate Actions

Questions relating to, and requests for additional copies of the notice of, this redemption should be directed to the Redemption and Paying Agent at 1-800-468-9716.

The Redemption Price shall become due and payable on the Redemption Date. Payment of the Redemption Price will be made promptly following the later of the Redemption Date and the time of book-entry transfer. Unless IPL defaults in the payment of the Redemption Price, no dividends on the Series D Preferred Stock being redeemed will accrue after the Redemption Date, nor will any interest accrue on amounts held by the Redemption and Paying Agent to pay the Redemption Price. On the Redemption Date, all rights of each holder of Series D Preferred Stock as a holder of Series D Preferred Stock shall terminate, other than the right to receive the Redemption Price.

Because the redemption is a redemption in full, the shares of the redeemed Series D Preferred Stock will be delisted from trading and not listed on any other exchange.

Forward-Looking Statements

This Current Report on Form 8-K includes "forward-looking statements" within the meaning of the federal securities laws, including Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended. 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 redemption of the Series D Preferred Stock and other risks outlined in IPL's public filings with the Securities and Exchange 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 Current Report on Form 8-K speaks as of the date hereof. Except as otherwise required by law, IPL undertakes no obligation to update or revise its forward-looking statements.

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