Company: AILIM
Filing Date: 2025-08-04
Form Type: 10-Q
Source: 0001002910-25-000112
Chunk: 25

Company: Ameren Illinois Co
Filing Date: 2025-08-04
Form: 10-Q
Item: Part I, Item 2
Chunk 25
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 energy center maintenance increased $4 million in the six months ended June 30, 2025, primarily due to an increase in coal additives.

Ameren Illinois

Other operations and maintenance expenses increased $1 million and $27 million in the three and six months ended June 30, 2025, respectively, compared with the year-ago periods, primarily due to the following items:

Ameren Illinois Electric Distribution

Other operations and maintenance expenses increased $3 million and $33 million in the three and six months ended June 30, 2025, respectively, primarily due to the following items (except where a specific period is referenced):

•Bad debt costs increased $4 million and $17 million, respectively, primarily because of a higher base level of expenses included in customer rates pursuant to the associated rider.

•Increased costs associated with customer energy-efficiency investments under formula ratemaking of $2 million and $6 million, respectively, primarily due to amortization of regulatory assets.

•Storm-related expenses, including related amortizations of previously deferred amounts, increased $3 million and $5 million, respectively, in 2025 due to major storms experienced throughout its service territory in 2025.

•Distribution expenditures increased $4 million in both periods, primarily due to higher levels of pole inspections and other maintenance activity.

The above increases in the three and six months ended June 30, 2025, compared with the year-ago periods, were partially offset by the following items (except where a specific period is referenced):

•Amortization of previous deferrals associated with bad debt costs on purchased receivables decreased $6 million in both periods, primarily because of a lower base level of expenses included in customer rates pursuant to the associated rider.

•Reduction in environmental remediation rider costs of $4 million in both periods.

Ameren Illinois Natural Gas

Other operations and maintenance costs decreased $4 million and $7 million in the three and six months ended June 30, 2025, respectively, primarily due to a decrease of $1 million and $4 million, respectively, in labor expense resulting from steps taken to align operations and maintenance expense as a result of the November 2023 ICC natural gas rate order. Additionally, expenses decreased by $3 million in both periods due to a decrease in energy efficiency rider costs.

Ameren Illinois Transmission

Other operations and maintenance expenses were comparable between periods.

58

Depreciation and Amortization Expenses