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Ameren Illinois rate increase

Electric · Illinois · Investor-owned utility · part of Ameren Corporation

Proposed

Last checked

Ameren Illinois has a request pending with regulators: 2025 cost reconciliation, sets 2027 delivery charges, seeking $31 million. See the details below for what the sources say about bill impacts.

Details and sources

Rate changes, newest first

2025 cost reconciliation, sets 2027 delivery charges

Other · Electric

Proposed

Typical residential bill

Not stated for a specific usage level. Any figures the sources give are in the summary below.

Filed
April 2026
Decision expected
December 2026
Requested effective
2027
Requested increase
$31 million
Approved increase
Pending
Docket
26-0214

Ameren Illinois first asked for $65.3 million to true up 2025 electric delivery costs against its rate plan. After ICC staff recommended about $31 million, Ameren revised its request to match. CUB testimony said the original proposal had at least $14.8 million in overcharges. A decision is expected by December 2026, and any approved amount would be collected in 2027.

Utility's stated reasons

  • actual 2025 delivery costs above the approved revenue requirement
  • interest on the under-recovery
Sources (4) · Verified against regulator or utility filings

Last verified Sep 29, 2026

2028-2031 multi-year grid plan (delivery charges)

Multi-year rate plan · Electric

Proposed

Typical residential bill

Not stated for a specific usage level. Any figures the sources give are in the summary below.

Filed
January 20, 2026
Decision expected
Not disclosed
Requested effective
Not disclosed
Requested increase
Not disclosed
Approved increase
Pending
Docket
26-0051

Ameren Illinois filed a $2.8 billion, four-year plan for distribution grid upgrades in 2028-2031. This case approves the plan only; Ameren will propose a multi-year rate plan in 2027 to set the delivery charges that pay for it. CUB testimony urges cutting over $300 million it calls wasteful or questionable. CUB expects a final ICC order around late 2026.

Utility's stated reasons

  • upgrade the local distribution grid
Sources (2) · Verified against regulator or utility filings

Last verified Sep 29, 2026

2024 cost reconciliation, sets 2026 delivery charges

Other · Electric

In effect

Typical residential bill

Not stated for a specific usage level. Any figures the sources give are in the summary below.

Filed
April 10, 2025
Decided
December 18, 2025
Effective
January 2026
Requested increase
$59.6 million
Approved increase
$48.39 million
Docket
25-0382

The ICC approved $48.4 million of Ameren Illinois' $59.6 million request to true up 2024 electric delivery costs, cutting $11.2 million, and applied it starting with January 2026 bills. In the case, Ameren argued that because a $158 million prior reconciliation charge ended after 2025, average customers' base delivery costs would fall in 2026.

Utility's stated reasons

  • actual 2024 delivery costs above the approved revenue requirement
  • interest on the under-recovery
Sources (3) · Verified against regulator or utility filings

Last verified Sep 29, 2026

2024-2027 multi-year rate plan and refiled grid plan (delivery charges)

Multi-year rate plan · Electric

In effect

Typical residential bill

Not stated for a specific usage level. Any figures the sources give are in the summary below.

Filed
March 2024
Decided
December 19, 2024
Effective
December 2024
Requested increase
Not disclosed
Approved increase
$309 million
Docket
22-0487/24-0238

On Dec. 19, 2024 the ICC approved Ameren Illinois' refiled 2024-2027 grid and rate plan. It cut proposed grid spending from $333 million to $83 million and trimmed the rate request 7% to an overall $309 million increase, with an 8.715% ROE. Ameren's 10-Q lists approved delivery revenue requirements of $1,367 million for 2026 and $1,421 million for 2027.

Utility's stated reasons

  • grid reliability
  • support electrification and state clean energy goals
Sources (3) · Verified against regulator or utility filings

Last verified Sep 29, 2026

Who decides

Utility website: www.ameren.com

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Last checked Oct 2, 2026. Spotted something out of date? Tell us.