Company: AILIM
Filing Date: 2025-11-06
Form Type: 10-Q
Source: 0001002910-25-000129
Chunk: 18

Company: Ameren Illinois Co
Filing Date: 2025-11-06
Form: 10-Q
Item: Part I, Item 2
Chunk 18
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 and +$7 million, respectively).

•Other revenues increased $3 million and $12 million, respectively, primarily due to mutual assistance provided to Ameren Missouri for major storms experienced in 2025 throughout its service territory and the recovery of and return on increased customer generation rebates.

•Revenues increased $6 million and $10 million, respectively, due to the recovery of and return on increased energy-efficiency program investments under performance-based formula ratemaking.

Other cost recovery mechanisms decreased revenues by $11 million for the three months ended September 30, 2025, primarily due to a lower amount of bad debt costs included in customer rates, effective June 2025, pursuant to the associated rider.

Ameren Illinois Transmission

Ameren Illinois Transmission’s revenues increased $21 million, or 14%, and $60 million, or 14%, for the three and nine months ended September 30, 2025, respectively, compared with the year-ago periods. Base rate revenues were primarily affected by higher recoverable expenses (+$8 million and +$39 million, respectively) and increased capital investment (+$6 million and +$14 million, respectively), as evidenced by an 8% increase in rate base used to calculate the revenue requirement. Additionally, revenues were favorably affected by a higher ROE (+$7 million in both periods) due to the absence of the October 2024 FERC order that decreased base ROE for certain historical periods.

Natural Gas Revenues

Ameren

Ameren’s natural gas revenues were comparable for the three months ended September 30, 2025, and increased $32 million, or 4%, for the nine months ended September 30, 2025, compared with the year-ago periods, due to increased revenues at Ameren Illinois Natural Gas and Ameren Missouri, as discussed below. 

Ameren Missouri

Ameren Missouri’s natural gas revenues were comparable for the three months ended September 30, 2025, and increased $6 million, or 6%, for the nine months ended September 30, 2025, compared with the year-ago periods, primarily due to colder winter temperatures.

55

Ameren Illinois Natural Gas

Ameren Illinois Natural Gas’ revenues were comparable for the three months ended September 30, 2025, and increased $26 million, or 4%, for the nine months ended September 30, 2025,