Exhibit 99.1 Contacts: Media Analysts Anthony Paraino Andrew Kirk 314.554.2182 314.554.3942 aparaino@ameren.com akirk@ameren.com NEWS RELEASE -- 1901 Chouteau Avenue: St. Louis, MO 63103: Ameren.com For Immediate Release Ameren Announces Third Quarter 2024 Results • Third Quarter GAAP Diluted Earnings Per Share (EPS) were $1.70 in 2024 vs. $1.87 in 2023 • Third Quarter Adjusted (Non-GAAP) Diluted Earnings Per Share were $1.87 in 2024 vs. $1.87 in 2023 • 2024 GAAP Diluted EPS Guidance Range is now $4.34 to $ ...