Storm hardening, electric grid upgrades and new generation underpin request to update electric rates in mid-2027

About this update from Ameren Corporation

Proposal reflects improvements already in service, keeps base rates well below the Midwest average and expands customer assistance Key takeaways: ST. LOUIS, June 26, 2026 /PRNewswire/ -- Ameren Missouri has filed a request with the Missouri Public Service Commission (PSC) to recover the costs of electric system upgrades and construction of new power generation assets, providing significant reliability and economic benefits to Missouri families and businesses. The PSC will conduct a thorough, 11-month review before new base electric rates take effect in mid-2027. "Our responsibility is to provide safe, reliable and affordable service for Missouri families and businesses. Those customers expect the lights to come on every time they flip the switch, especially during the ever more frequent extreme weather," said Aaron Melda, chairman and president of Ameren Missouri, a subsidiary of Ameren Corporation (NYSE: AEE). "The investments we are making today are supporting reliability and strengthening storm resilience. The results are already showing up in fewer outages and better service for the communities we serve." Melda noted that from January 2025 through May 2026, the installation of storm-resistant electric infrastructure and smart technology helped prevent more than 260,000 customer outages during major storms, reducing service disruptions for customers.  If approved by regulators, the proposed change in mid-2027 would increase the average residential electric bill with 1,011 kilowatt-hours of usage by about $13 a month. Today, residential rates for Ameren Missouri customers are approximately 27% below Midwest and national averages and are the lowest among Missouri's investor-owned utilitiesi. Ameren Missouri's residential base rates are expected to remain well below those averages even if this request is approved.  Key components of the rate adjustment request include:

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