Company: AILIM
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001002910-25-000055
Chunk: 91

Company: Ameren Illinois Co
Filing Date: 2025-02-18
Form: 10-K
Item: Item 8
Chunk 91
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 fund for Ameren Missouri’s Callaway Energy Center is reported as “Nuclear decommissioning trust fund” in Ameren’s and Ameren Missouri’s balance sheets. This amount is legally restricted and may be used only to fund the costs of nuclear decommissioning. Changes in the fair value of the trust fund are recorded as an increase or decrease to the nuclear decommissioning trust fund, with an offsetting adjustment to the regulatory liability related to AROs. This reporting is consistent with the method used to account for the decommissioning costs recovered in rates. See Note 2 – Rate and Regulatory Matters for the regulatory liability recorded at December 31, 2024. If the assumed return on trust assets is not earned, Ameren Missouri believes that it is probable that any additional funding requirements resulting from such earnings deficiency will be recovered in customer rates.The following table presents proceeds from the sales and maturities of investments in Ameren Missouri’s nuclear decommissioning trust fund and the gross realized gains and losses resulting from those sales for the years ended December 31, 2024, 2023, and 2022:202420232022Proceeds from sales and maturities$564 $240 $216 Gross realized gains44 6 40 Gross realized losses28 11 10 

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The following table presents the cost and fair value of investments in debt and equity securities in Ameren’s and Ameren Missouri’s nuclear decommissioning trust fund at December 31, 2024 and 2023:Security TypeCostGross Unrealized GainGross Unrealized LossFair Value2024Debt securities$437 $2 $17 $422 Equity securities179 740 8 911 Cash and cash equivalents10 — — 10 Other(a)(1)— — (1)Total$625 $742 $25 $1,342 2023Debt securities$382 $3 $31 $354 Equity securities191 603 7 787 Cash and cash equivalents5 — — 5 Other(a)4 — — 4 Total$582 $606 $38 $1,150 (a)Represents net receivables and payables relating to pending securities sales, interest, and securities purchases.The following table presents the costs and fair values of investments in debt securities