Company: AILIM
Filing Date: 2025-11-06
Form Type: 10-Q
Source: 0001002910-25-000129
Chunk: 141

Company: Ameren Illinois Co
Filing Date: 2025-11-06
Form: 10-Q
Item: Part I, Item 1
Chunk 141
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 and Ameren Illinois are generally allowed to pass on to customers prudently incurred costs for fuel and purchased power. Ameren’s electric fuel and purchased power expenses increased $269 million, or 54%, and $910 million, or 79%, for the three and nine months ended September 30, 2025, respectively, compared with the year-ago periods, primarily due to increased fuel and purchased power expenses at Ameren Missouri and Ameren Illinois Electric Distribution, as discussed below. 

Ameren Missouri

Ameren Missouri’s fuel and purchased power expenses increased $153 million, or 46%, and $742 million, or 108%, for the three and nine months ended September 30, 2025, respectively, compared with the year-ago periods.

The following items increased Ameren Missouri’s fuel and purchased power expenses for the three and nine months ended September 30, 2025:

•Energy costs increased $148 million and $750 million, respectively, primarily due to summer capacity prices increasing from $30 per MW-day in 2024 to $667 per MW-day in 2025 pursuant to the April 2025 annual MISO capacity auction. Ameren Missouri’s 5% exposure to net energy cost variances under the FAC of $2 million and $5 million for the three and nine months ended September 30, 2025 is the difference between “Off-system sales, capacity, transmission, and FAC revenues, net” in electric revenues and “Energy costs (excluding the estimated effect of weather)”.

•Fuel and purchased power expenses increased an estimated $4 million and $8 million, respectively, due to an increase in electric retail sales related to weather.

•Transmission service charges (not included in the FAC) increased $2 million and $7 million, respectively, due to higher transmission rates related to increased revenue requirements of other MISO transmission operators.

“Cost recovery mechanisms — offset in electric revenue” decreased fuel and purchased power expenses $19 million for the nine months ended September 30, 2025, due to decreased amortization of costs previously deferred under the FAC. The changes to “Cost recovery mechanisms - offset in electric revenue” are fully offset by “Cost recovery mechanisms - offset in fuel and purchased power” in electric revenues.

Ameren Illinois Electric Distribution

Ameren Illinois Electric Distribution’s purchased power expenses increased $126 million, or 62%, and $201 million, or 36%, for the