ST. LOUIS, Sept. 15, 2025 /PRNewswire/ -- Ameren Illinois Company, a subsidiary of Ameren Corporation (NYSE: AEE), announced today the pricing of a public offering of $350 million aggregate principal amount of 5.625% first mortgage bonds due 2055 at 103.196% of their principal amount, with a re-offer yield of 5.405%. The first mortgage bonds will be a further issuance of Ameren Illinois' 5.625% first mortgage bonds due 2055 issued on March 3, 2025, in the principal amount of $350 million. The transaction is expected to close on September 26, 2025, subject to the satisfaction of customary closing conditions.