Proposed tariff changes for gas service rates in Illinois effective after hearings.

PUBLIC NOTICE Notice of Proposed Tariff Changes Gas Service Schedule Ill. C. C. No. 2  To the Gas Patrons of  Ameren Illinois Company d/b/a Ameren Illinois: Ameren Illinois (or Company) hereby gives notice to the public that on March 30, 2026, it filed with the Illinois Commerce Commission  evidence (direct testimony) regarding the reconciliation of revenues collected from its gas customers under the Company's Rider TAR and Gas Environmental Adjustment (Rider GEA), with costs incurred in connection with certain environmental remediation activities associated with its manufactured gas plant sites in Illinois from January 1, 2025 through December 31, 2025. Rider TAR is applicable to Rate Zone II (formerly the AmerenCILCO service territory) and Rider GEA is applicable to Rate Zones I and III (formerly the AmerenCIPS and AmerenIP services territories, respectively). This reconciliation may result in changes to the Company's rates and charges with respect to gas delivery service charges throughout the Company's territories in Illinois. The changes in rates and charges will take effect after hearings and after the Commission issues its final Order. The Commission docketed these filings as Docket Nos. 25-1046 (RZ I), 25-1047 (RZ II), and 25-1048 (RZ III). A copy of the evidence may be inspected at the Ameren Illinois offices located at 300 Liberty Street, Peoria, Illinois or online at www.icc.illinois.gov/e-docket/. All parties interested in this matter may obtain information with respect thereto either directly from Ameren Illinois or by addressing the Chief Clerk of the Illinois Commerce Commission, 527 East Capitol Avenue, Springfield, Illinois 62706. AMEREN ILLINOIS COMPANY d/b/a Ameren Illinois By: Patrick Smith, President