AEE · 10-Q · 2026Q3 · Full report

Rate Case Outcomes

AMEREN CORP · 2026-11-06 · Importance 62 · Surprise 58 · From source text

In June 2026, Ameren Missouri requested a $343 million annual increase in electric-service revenues, with a MoPSC decision expected by May 2027 and new rates expected by June 2027. Ameren Illinois and ATXI’s 2027 electric-transmission revenue requirements are $749 million and $319 million, up $64 million and $53 million, respectively, from 2026, primarily because of higher expected rate base. Ameren Illinois’ approved electric-distribution revenue requirements rise from $1,206 million in 2024 to $1,421 million in 2027, a cumulative four-year increase of $308 million from the 2023 requirement. In August 2026, Ameren Illinois requested recovery of $28 million in its 2025 electric-distribution reconciliation, with an ICC decision due by December 2026 and any approved amount collected in 2027.

Key facts

• In June 2026, Ameren Missouri requested a $343 million increase in annual electric-service revenues; a MoPSC decision is expected by May 2027 and new rates by June 2027.
• The ICC-approved Ameren Illinois electric distribution revenue requirements for 2024 through 2027 are $1,206 million, $1,287 million, $1,367 million, and $1,421 million, respectively.
• In August 2026, Ameren Illinois requested recovery of $28 million in an updated reconciliation adjustment for its 2025 electric distribution service revenue requirement; an ICC decision is required by December 2026, and any approved adjustment would be collected in 2027.
• The ICC approved Ameren Illinois electric distribution revenue requirements for 2024, 2025, 2026, and 2027 of $1,206 million, $1,287 million, $1,367 million, and $1,421 million, respectively.
• In June 2026, Ameren Missouri requested MoPSC approval to increase annual electric service revenues by $343 million, based on a 10.25% return on common equity, 52% common equity capital structure, and $16.7 billion rate base.
• The ICC’s November 2025 natural gas rate order reduced planned Ameren Illinois distribution and transmission capital investments by $75 million; Ameren Illinois appealed the order in January 2026, and the court has no deadline to address the appeal.
• Ameren Illinois updated its 2025 electric distribution revenue reconciliation adjustment request in August 2026, seeking recovery of $28 million; an ICC decision is required by December 2026 and any approved adjustment would be collected from customers in 2027.
• The MoPSC electric rate proceeding is expected to conclude with a decision by May 2027 and new rates effective by June 2027.

Impact estimates