Company: AILIM
Filing Date: 2025-11-06
Form Type: 10-Q
Source: 0001002910-25-000129
Chunk: 144

Company: Ameren Illinois Co
Filing Date: 2025-11-06
Form: 10-Q
Item: Part I, Item 1
Chunk 144
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, for activity not reported as part of a segment, as reflected in “Other/Intersegment Eliminations” above. This is primarily due to a decrease of $13 million in the elimination of the non-service cost component of net periodic benefit income in the nine months ended September 30, 2025. The non-service cost component of net periodic benefit cost or income at Ameren Services is allocated to the segments and primarily included in the segments’ other operations and maintenance expenses. The decreases are offset by the absence of a gain on the sale of land of $9 million that occurred in 2024.

Ameren Transmission

Other operations and maintenance expenses were comparable between periods. 

Ameren Missouri

Other operations and maintenance expenses decreased $28 million and $41 million in the three and nine months ended September 30, 2025, respectively, compared with the year-ago periods. The following items decreased other operations and maintenance expenses in the three and nine months ended September 30, 2025, compared with the year-ago periods:

•The absence in 2025 of a $44 million and $59 million charge in the three and nine months ended September 30, 2025, related to the NSR and Clean Air Act litigation associated with the Rush Island Energy Center.

•Expenses associated with the MEEIA customer energy-efficiency program decreased $4 million and $11 million, respectively, as approved by the MoPSC in November 2024.

59

The following items partially offset the decrease in other operations and maintenance expenses for the three and nine months ended September 30, 2025, compared with the year-ago periods (except where a specific period is referenced):

•Non-nuclear energy center operations and maintenance expenses increased $6 million and $10 million in the three and nine months ended September 30, 2025.

•Increased expense of $5 million and $9 million, respectively, for cloud-related software.

•Transmission and distribution storm-related expenses increased $8 million in the nine months ended September 30, 2025, primarily because of the major storms experienced throughout its service territory in 2025.

•Transmission and distribution expenditures, excluding major storm-related costs, increased $6 million and $4 million in the three and nine months ended September 30, 2025, respectively, largely due to increased vegetation management expenditures and higher levels of pole inspections.

Ameren Illinois

Other operations and maintenance expenses increased $12 million and $39