Commercial rate guide for Ameren — Missouri (Ameren Missouri, including St. Louis) and central/southern Illinois (Ameren Illinois, including Springfield and Peoria)
Missouri: 2M (small general service) and 3M (large general service) with demand charges. Illinois: DS-3 and DS-4 for commercial with demand-based delivery charges. MISO capacity costs in Illinois.
Rising
5.5% electric rate increase in Missouri effective April 2026 approved by MO PSC;
5.5% electric rate increase in Missouri effective April 2026 approved by MO PSC; Illinois delivery charges increased 4.9% effective January 2026
Property managers with Ameren accounts frequently encounter these billing challenges:
Different regulatory structures between MO and IL operations
MISO capacity cost pass-through in Illinois
Fuel adjustment clause volatility in Missouri
Demand charges during summer peaks
Gas performance-based ratemaking adjustments
Businesses can choose their energy supplier in this market.
Illinois territory is deregulated with competitive supply choice via ARES. Missouri territory is regulated with no supply choice. Gas is regulated in both states.
Missouri smart grid investment plan (SGIP) cost recovery pending; Illinois formula rate update filed with ICC
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