Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 263

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 7
Chunk 263
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Ameren MissouriAmeren Illinois Natural GasOther/Intersegment EliminationsAmeren Illinois Electric DistributionAmeren Transmission

Depreciation and amortization expenses increased $203 million, $134 million, and $63 million at Ameren, Ameren Missouri, and Ameren Illinois, respectively, primarily because of additional property, plant, and equipment investments across their respective segments. In addition, Ameren’s and Ameren Missouri’s depreciation and amortization expenses were affected by the following items, which include the effect of the additional investments at Ameren Missouri:

•The deferral to a regulatory liability related to production tax credits allowed under the IRA associated with the Callaway Energy Center that increased expenses by $90 million.

•Increased depreciation and amortization of $40 million due to the inclusion in base rates of amounts previously deferred under the PISA and RESRAM effective July 9, 2023, pursuant to the June 2023 MoPSC electric rate order.

•Increased amortization of prior deferrals and the lower net under-recovery of RESRAM eligible expenses increased depreciation and amortization expenses by $33 million.

•Depreciation and amortization rate changes pursuant to the electric rate order noted above, which increased depreciation and amortization expenses by $4 million.

•Depreciation and amortization expenses reflected a deferral to a regulatory asset of depreciation associated with investments in eligible property, plant, and equipment not yet included in base rates, pursuant to PISA and RESRAM. Base rates were updated to include the eligible property, plant, and equipment in-service through December 31, 2022, when new customer rates became effective on July 9, 2023, pursuant to the June 2023 MoPSC electric rate order. The effect of rebasing PISA and RESRAM, partially offset by increased amortization of prior PISA deferrals, decreased depreciation and amortization by $30 million.

•The higher net deferral pursuant to a tracker related to certain excess deferred income taxes, which decreased depreciation and amortization expenses by $5 million.

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Table of Contents

Taxes Other Than Income Taxes

Total by Segment(a)Increase by SegmentOverall Ameren Increase of $25 Million

(a)Includes $9 million and $8 million at Ameren Transmission in 2024 and 2023, respectively, and other/intersegment eliminations of $13 million and $12 million in 2024 and 2023, respectively.

Ameren Missouri