Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 262

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 7
Chunk 262
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 rider.

•Amortization of previous deferrals associated with bad debt costs on purchased receivables increased $15 million, 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 $13 million, primarily due to amortization of regulatory assets.

•Benefit costs increased $6 million, primarily due to an increase in medical benefit claims related to active plan participants.

•Increased labor expense of $5 million, primarily caused by reduced capital expenditures due to steps taken to align operations with the MYRP orders, resulting in more maintenance activities.

•Absence of major storm-related cost deferrals in 2024 increased expense by $4 million.

•Vegetation management costs increased by $4 million due to increased activity.

•Labor expense increased by $3 million due to assistance provided to other utilities to aid in storm recovery efforts, primarily caused by hurricane damage.

The following items partially offset the above increases in other operations and maintenance expenses between years:

•Reduction in environmental remediation rider costs of $14 million.

•Technology-related expenditures decreased $3 million resulting from lower levels of software licenses and rentals.

Ameren Illinois Natural Gas

Other operations and maintenance costs decreased $7 million in 2024, compared with 2023, primarily due to a decrease of $6 million in contractor service costs and a $4 million decrease in labor expense due to steps taken to align operations with the November 2023 ICC natural gas rate order. These decreases were partially offset by an increase of $2 million in cloud computing costs.

Ameren Illinois Transmission

Other operations and maintenance expenses increased $8 million in 2024, compared with 2023, primarily because of increased costs related to ATXI’s operations control center, which was placed in service in December 2023. ATXI provides affiliates with access to this facility. The rent expense associated with this facility is an affiliate transaction and eliminated in consolidation for purposes of Ameren’s consolidated financial statements. See Note 13 - Related-party Transactions under Part II, Item 8, of this report for additional information.

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Table of Contents

Depreciation and Amortization Expenses

Total by Segment(a)Increase by SegmentOverall Ameren Increase of $203 Million

(a)Includes other/intersegment eliminations of $8 million and $7 million in 2024 and 2023, respectively