ITEM 8.01 Other Events.

On January 6, 2023, Ameren Illinois Company ("Ameren Illinois") filed a request with the Illinois Commerce Commission ("ICC") seeking approval to increase its annual revenues for natural gas delivery service by $160 million, which includes an estimated $77 million of annual revenues that would otherwise be recovered under Ameren Illinois' qualifying infrastructure plant rider and other riders. The request is based on a 10.7% return on common equity, a capital structure composed of 54% common equity, and a rate base of $2.9 billion. In an attempt to reduce regulatory lag, Ameren Illinois used a 2024 future test year in this proceeding.

A decision by the ICC in this proceeding is required by early December 2023, with new rates expected to be effective by January 2024. Ameren Illinois cannot predict the level of any delivery service rate change the ICC may approve, nor whether any rate change that may eventually be approved will be sufficient to enable Ameren Illinois to recover its costs and earn a reasonable return on its investments when any rate change goes into effect.

This combined Form 8-K is being filed separately by Ameren Corporation and Ameren Illinois Company (each a "registrant"). Information contained herein relating to any individual registrant has been filed by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant.

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