Company: AILIM
Filing Date: 2025-11-06
Form Type: 10-Q
Source: 0001002910-25-000129
Chunk: 16

Company: Ameren Illinois Co
Filing Date: 2025-11-06
Form: 10-Q
Item: Part I, Item 2
Chunk 16
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 rate base used to calculate the revenue requirement. Additionally, revenues were favorably affected by a higher ROE 

(+$10 million in both periods) due to the absence of the October 2024 FERC order that decreased base ROE for certain historical periods.

Ameren Missouri

Ameren Missouri’s electric revenues increased $361 million, or 27%, and $991 million, or 34%, for the three and nine months ended September 30, 2025, respectively, compared with the year-ago periods.

The following items increased Ameren Missouri’s electric revenues for the three and nine months ended September 30, 2025:

•“Off-system sales, capacity, transmission, and FAC revenues, net” increased $146 million and $745 million, respectively, primarily due to summer capacity prices increasing from $30 per MW-day in 2024 to $667 per MW-day in 2025 pursuant to the April 2025 annual MISO capacity auction. 

•Higher electric base rates, excluding the change in base rates for the MEEIA customer energy-efficiency programs and the RESRAM, resulting from the April 2025 MoPSC electric rate order effective June 1, 2025, increased revenues an estimated $143 million and $187 million, respectively. See Note 2 – Rate and Regulatory Matters under Part I, Item 1, of this report for additional information regarding the April 2025 MoPSC electric rate order.

•The effect of weather increased revenues an estimated $37 million and $48 million, respectively, primarily due to warmer July temperatures and colder winter temperatures.

•Revenues increased $11 million and $35 million, respectively, due to surcharges related to the servicing of securitized utility tariff bonds issued in December 2024 to finance costs related to the accelerated retirement of the Rush Island Energy Center. This increase in revenue is offset by increases in interest and amortization expense. See Variable Interest Entities in Note 1 – Summary of Significant Accounting Policies under Part I, Item 1, of this report for additional information.

•Excluding the estimated effects of weather and the MEEIA customer energy-efficiency programs, electric revenues increased an estimated $23 million in both periods, primarily due to increased retail sales volumes and higher demand charges, partially offset by lower realized prices due to changes in customer usage patterns.

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The following items decreased Ameren Missouri’s electric revenues for the three and