ICC rejects Ameren Illinois grid plan; approves $142M revenue increase vs $444M requested

AMEREN CORP

ICC rejected Ameren Illinois' 5-year grid plan and adopted alternative rate-setting methodology through 2027.
Approved cumulative revenue increase of $142M (corrected) vs $444M requested; ROE set at 8.72% with 50% equity.
Rate base frozen at $3.872B (2022 year-end) until revised grid plan approved; 2023 rate base estimate $4.3B.
Ameren Illinois may cut capex and opex; will seek rehearing and may appeal; reconciliation cap set at 105%.
Electric rates effective Jan 1, 2024; existing riders and revenue decoupling remain in place.

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