Company: AILIM
Filing Date: 2025-11-06
Form Type: 10-Q
Source: 0001002910-25-000129
Chunk: 23

Company: Ameren Illinois Co
Filing Date: 2025-11-06
Form: 10-Q
Item: Part I, Item 2
Chunk 23
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Other Operations and Maintenance Expenses

Increase (Decrease) by SegmentOverall Ameren Decrease of $18 Million (QTD YoY)Overall Ameren Decrease of $8 Million (YTD YoY)Total by Segment(a)

(a)Includes $19 million and $19 million at Ameren Transmission in the three months ended September 30, 2025 and 2024, respectively. Includes other/intersegment eliminations of $(3) million and $(1) million in the three months ended September 30, 2025 and 2024, respectively. Also includes other/intersegment eliminations of $(15) million and $(8) million in the nine months ended September 30, 2025 and 2024, respectively. 

Ameren MissouriAmeren Illinois Natural GasOther/Intersegment EliminationsAmeren Illinois Electric DistributionAmeren Transmission

Ameren

Other operations and maintenance expenses decreased $18 million and $8 million in the three and nine months ended September 30, 2025, due to the changes discussed below. In addition to changes by segments discussed below, other operations and maintenance expenses were comparable in the three months ended September 30, 2025 and decreased $7 million in the nine months ended September 30, 2025, respectively, 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,