ICC Reduces Ameren Illinois Rate Reconciliation Request

FOR IMMEDIATE RELEASE December 18, 202 5 PRESS CONTACT Cayli Baker O ff i c e: (312) 793 - 8841 Cayli.Baker @illinois.gov ICC issues de cision on Ameren rate reconciliation Springfield, Il – The I llinois C ommerce C omm ission (ICC) struck $11.2 m illion f r om Ameren Illinois’ $59.6 mil lion m ulti - y ear rate reconcili ation req uest. T he dec ision is th e f irst in a n ew performance- based e valuation process de signe d to reconcile a ctual u tilit y spending with the a pproved investments outlined in the utility ’ s mul ti - year g rid a nd rate plans. “The IC C’s re spons ibility is to ba lance the int erests o f Illinoi s’ utili ties a nd the i r consumers, and our new gr id pl anning pr ocess is de signe d to hol d th e s tate’s largest el ectric u t ilities a ccou ntable for their performance,” s aid ICC C hairman D oug Scott. “The I CC’s de cision today reiterates that uns upported departures fr om A meren ’s a pproved grid plan are inconsistent with the goa ls of t he gr id pl anning process, and i t i s the u tility’s r esponsibility to prove t hat any adjustments made a re r easonable a nd prudent fo r main taining our pow er system. ” The de cision require s Ameren to include a ffordability data u pdates a nd cost be nefit analyses o f related grid pl an pr ojects i n future rate reconciliat ion do ckets to al lo w the ICC a nd r elevant stakeholders t o evalua te the impact of A mer en ’s gr id pl an i n re al time. In 2024, the ICC a pproved Ameren’s r evised grid plan to strengthen power gr id reliability, support progress toward Illinois’ c lean energy goals, and hold A meren a ccountable f or meeting the performance metrics s et by the C ommission. I n addition to the electr ic g rid pla n re quire ment, the Climate a nd Equi table J obs A ct (CEJA) s ubject s Ameren and C omEd to performance- based evaluations in pl ace of a preapproved formu la rates. The ICC i ssued i ts decision af ter c losely sc rutinizing Ameren ’ s r econciliation filing, al ong w ith materials s u bmitted by t he ut ility, ICC s taff, a nd vario us intervenor s ove r the c ourse o f a n e ight -month legal p roceeding. In accordance w ith the P ublic Utilities A ct, proposed c osts are re coverable onl y w hen the ut ility demonstrates t hey are reasonable a nd prudent. I n addition t o t raditional s tandards under the Public U tili ties A ct, the I CC e valuated A meren’ s actual co sts using the cost - effectiven ess, coor dinated long term planning, equity, affordability, and transparency considerations outlined in CEJA. The impact of the decision on individual customers will vary based on service class and energy usage. Ameren I llinois s erves 1.2 mil lion e lectric customers in c entral and s outhern Il linois. More in formation regarding A meren’s annual reconciliation can be found in Docket No. 25-0382. ### About the I llinois C ommerce C ommission The Il linois C ommerce C ommission (ICC) is a q uasi -judicial body made up of five

Commission ers. Through its Public Utility Program, the Commission over sees the provision of adequate, reliable, effi cient, and safe utility se rvices at the least possible co st to Illinois citizens served by ele ctric, natural gas, telecommunications, w ater, and sewer public utility co mpanies. To learn more about the Commission, its offices, and bureaus, click her e. If you are a consumer who needs help resolving a utility dispute call 800 -524- 0795 or file a n online complaint here. For a complaint rela ted to transpo rtation, ca ll 217-782-6448. Follow the Illin ois Commerc e Commiss ion on social media @ILCommerc eComm.