Ameren Illinois Announces Pricing of First Mortgage Bonds Offering due 2047

ST. LOUIS, Nov. 16, 2017

Ameren Illinois intends to use the net proceeds of the offering to repay short-term debt, including short-term debt that it incurred in connection with the repayment at maturity of $250 million aggregate principal amount of its 6.125% senior secured notes due Nov. 15, 2017.

J.P. Morgan Securities LLC, Mizuho Securities USA LLC, MUFG Securities Americas Inc., BNP Paribas Securities Corp., KeyBanc Capital Markets Inc., SunTrust Robinson Humphrey, Inc. and TD Securities (USA) LLC are acting as joint book-running managers for the offering.

The offering is being made only by means of a prospectus and related prospectus supplement. A prospectus supplement related to the offering will be filed with the Securities and Exchange Commission. Copies of the prospectus supplement and accompanying prospectus, when available, for the offering may be obtained on the Securities and Exchange Commission's website at www.sec.gov, or by contacting J.P. Morgan Securities LLC, 383 Madison Avenue, New York, New York 10179, Attention: Investment Grade Syndicate Desk – 3rd floor, telephone: (212) 834-4533.

This press release does not constitute an offer to sell or the solicitation of an offer to buy the first mortgage bonds or any other securities and shall not constitute an offer, solicitation or sale in any jurisdiction in which, or to any person to whom, such an offer, solicitation or sale is unlawful.

About Ameren Illinois

Ameren Illinois delivers energy to 1.2 million electric and 816,000 natural gas customers in Illinois.  Ameren Illinois' mission is to power the quality of life.  The company's service territory covers more than 1,200 communities and 43,700 square miles.  For more information, visit AmerenIllinois.com, find us on Twitter @AmerenIllinois or Facebook.