Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 236

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 7
Chunk 236
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 Base ($ in billions)(a)Regulatory Frameworks(c)Electric Customer Rates(f)SegmentRegulatory FrameworkAmerenTransmissionFormula ratemaking with initial rates based on a future test yearAllowed ROE of 10.48%Ameren IllinoisElectricDistributionFuture test year ratemaking under an MYRP(d) and RBAAllowed ROE of 8.72%(e)Ameren IllinoisNatural GasFuture test year ratemaking and PGA and VBAAllowed ROE of 9.44%AmerenMissouriHistorical test year ratemaking andPISA, RESRAM, FAC, MEEIA, PGAAllowed ROE is not specified(a)Reflects year-end rate base except for Ameren Transmission, which is average rate base. Ameren Illinois Electric Distribution excludes electric energy-efficiency rate base.(b)Compound annual growth rate.(c)As of January 2025.(d)Ameren Illinois filed appeals of the December 2023 and June 2024 orders, and intends to file an appeal of the December 2024 ICC order, in its MYRP proceeding. For more information on the MYRP proceeding, see Note 2 – Rate and Regulatory Matters under Part II, Item 8, of this report.(e)Ameren Illinois’ formula ratemaking framework related to energy-efficiency investments uses an allowed ROE of the annual average of the monthly yields of the 30-year United States Treasury bonds plus 580 basis points, subject to performance standards discussed in Note 2 – Rate and Regulatory Matters under Part II, Item 8, of this report.(f)Average residential electric prices. Source: Edison Electric Institute, ‘Typical Bills and Average Rates Report’ for the 12 months ended June 30, 2024.

Key announcements, updates, and regulatory outcomes

In September 2023, the United States District Court for the Eastern District of Missouri granted Ameren Missouri’s request to modify a September 2019 remedy order issued by the district court in order to allow the retirement of the Rush Island Energy Center in advance of its previously expected retirement date of 2039, in lieu of installing a flue gas desulfurization system. Ameren Missouri retired the Rush Island Energy Center on October 15, 2024. In December 2024, the United States District Court for the Eastern District of Missouri issued an order resolving all outstanding claims in this case. The order requires Ameren Missouri to fund a program to provide