Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 266

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 7
Chunk 266
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 with 2023, primarily due to issuances of long-term debt in May 2023, June 2024 and August 2024, which collectively increased interest charges by $9 million. Additionally, an increase on long-term debt and a higher interest rate on an increased level of short-term borrowings increased interest charges by $8 million and $2 million, respectively.

Ameren Missouri

Interest charges increased $17 million in 2024, compared with 2023, primarily due to issuances of long-term debt in March 2023, January 2024, April 2024, and October 2024, which collectively increased interest charges by $48 million.

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Table of Contents

The following items partially offset the above increase in interest charges between years:

•Increase in the borrowed funds capitalized as part of the allowance for funds used during construction of $12 million, primarily due to higher average construction work in progress balances.

•Interest charges decreased by $9 million due to the maturity of $350 million senior secured notes bearing a 3.5% interest rate in April 2024 that were repaid with cash on hand.

•Interest charges reflected a deferral to a regulatory asset of interest 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. This update to base rates resulted in a higher deferral of interest in 2024 pursuant to PISA and RESRAM that decreased interest charges by $5 million.

•Lower levels of short-term borrowings decreased interest charges by $4 million.

Ameren Illinois

Interest charges increased $37 million in 2024, compared with 2023, primarily due to the following:

Ameren Illinois Transmission

Interest charges increased by $20 million, primarily due to issuances of long-term debt in May 2023 and June 2024, which increased interest charges by $10 million. Additionally, an increase of interest on long-term debt, a higher interest rate on an increased level of short-term borrowings, and interest charges resulting from the October 2024 FERC ROE order increased interest charges by $4 million, $2