ST. LOUIS, Sept. 15, 2025 /PRNewswire/ -- Ameren Illinois Company, a subsidiary of Ameren Corporation $(AEE)$, has announced the pricing of a public offering of $350 million aggregate principal amount of 5.625% first mortgage bonds due 2055. The bonds are priced at 103.196% of their principal amount, with a re-offer yield of 5.405%. This issuance is a further issuance of Ameren Illinois' 5.625% first mortgage bonds due 2055 initially issued on March 3, 2025, in the principal amount of $350 million. The transaction is expected to close on September 26, 2025, subject to customary closing conditions. Ameren Illinois plans to use the net proceeds from this offering to repay a portion of its short-term debt. The offering is being made solely through a prospectus and related prospectus supplement, which will be filed with the Securities and Exchange Commission. For more information, the prospectus can be accessed via the Securities and Exchange Commission's website at https://www.sec.gov.