Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 255

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 7
Chunk 255
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 offset in electric revenue” in fuel and purchased power.

•In accordance with the June 2024 MoPSC financing order, revenues decreased $13 million due to the deferral of base rate revenues to a regulatory liability related to the Rush Island Energy Center since its October 15, 2024 retirement date. The regulatory liability will be refunded to customers in a future rate proceeding.

Ameren Illinois

Ameren Illinois’ electric revenues decreased $51 million, or 2%, in 2024, compared with 2023, driven by decreased revenues at Ameren Illinois Electric Distribution, partially offset by increased revenues at Ameren Illinois Transmission.

Ameren Illinois Electric Distribution

Ameren Illinois Electric Distribution’s revenues decreased $129 million, or 6%, in 2024, compared with 2023.

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Table of Contents

The following items had an unfavorable effect on Ameren Illinois Electric Distribution’s revenues in 2024, compared with 2023:

•Revenues associated with “Cost recovery mechanisms – offset in fuel and purchased power” decreased $193 million, due to decreased purchased power expenses recovered from customers. The decreases in electric revenues are fully offset by decreases in purchased power expenses under cost recovery mechanisms for purchased power, as discussed below.

•Pursuant to an ICC order, revenues decreased $23 million, due to an increase in the amortization rate for certain excess deferred income taxes.

The following items had a favorable effect on Ameren Illinois Electric Distribution’s revenues in 2024, compared with 2023:

•Other cost recovery mechanisms increased revenues by $45 million, primarily due to a higher amount of bad debt and purchased receivables from alternative retail electric suppliers included in customer rates pursuant to their associated riders, partially offset by lower environmental remediation revenues.

•Revenues associated with customer energy-efficiency program investments increased $21 million, due to the recovery of program expenses (+$15 million), an increase in the ROE (+$4 million) primarily due to maximum achievement of the annual 2023 energy savings goals, and increased investment of $2 million.

•Base rates increased revenues by $14 million, primarily due to higher recoverable non-purchased power expenses (+$38 million), partially offset by a lower recognized ROE (-$24 million). The MYRP utilizes a fixed ROE approved by the ICC of 8.72%, with adjustments for any performance incentives and penalties, while the IEIMA formula-based ROE was based on the annual