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ICC issues decision on Ameren rate
reconciliation
[December 19, 2025]
Springfield, Il – The Illinois
Commerce Commission (ICC) struck $11.2 million from Ameren Illinois’
$59.6 million multi-year rate reconciliation request. The decision
is the first in a new performance-based evaluation process designed
to reconcile actual utility spending with the approved investments
outlined in the utility’s multi-year grid and rate plans.
“The ICC’s responsibility is to balance the interests of Illinois’
utilities and their consumers, and our new grid planning process is
designed to hold the state’s largest electric utilities accountable
for their performance,” said ICC Chairman Doug Scott. “The ICC’s
decision today reiterates that unsupported departures from Ameren’s
approved grid plan are inconsistent with the goals of the grid
planning process, and it is the utility’s responsibility to prove
that any adjustments made are reasonable and prudent for maintaining
our power system.”
The decision requires Ameren to include affordability data updates
and cost benefit analyses of related grid plan projects in future
rate reconciliation dockets to allow the ICC and relevant
stakeholders to evaluate the impact of Ameren’s grid plan in real
time.
In 2024, the ICC approved Ameren’s revised grid plan to strengthen
power grid reliability, support progress toward Illinois’ clean
energy goals, and hold Ameren accountable for meeting the
performance metrics set by the Commission. In addition to the
electric grid plan requirement, the Climate and Equitable Jobs Act (CEJA)
subjects Ameren and ComEd to performance-based evaluations in place
of a preapproved formula rates.
The ICC issued its decision after closely scrutinizing Ameren’s
reconciliation filing, along with materials submitted by the
utility, ICC staff, and various intervenors over the course of an
eight-month legal proceeding. In accordance with the Public
Utilities Act, proposed costs are recoverable only when the utility
demonstrates they are reasonable and prudent. In addition to
traditional standards under the Public Utilities Act, the ICC
evaluated Ameren’s actual costs using the cost-effectiveness,
coordinated long term planning, equity, affordability, and
transparency considerations outlined in CEJA.
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The impact of the
decision on individual customers will vary based on service
class and energy usage.
Ameren Illinois serves 1.2 million electric customers in central
and southern Illinois. More information regarding Ameren’s
annual reconciliation can be found in Docket No. 25-0382.
About the Illinois Commerce Commission
The Illinois Commerce Commission (ICC) is a quasi-judicial body
made up of five Commissioners. Through its Public Utility
Program, the Commission oversees the provision of adequate,
reliable, efficient, and safe utility services at the least
possible cost to Illinois citizens served by electric, natural
gas, telecommunications, water, and sewer public utility
companies. To learn more about the Commission, its offices, and
bureaus, click here. If you are a consumer who needs help
resolving a utility dispute call 800-524-0795 or file an online
complaint here. For a complaint related to transportation, call
217-782-6448.
[Illinois Commerce Commission]
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