Company: AILIM
Filing Date: 2025-08-04
Form Type: 10-Q
Source: 0001002910-25-000112
Chunk: 49

Company: Ameren Illinois Co
Filing Date: 2025-08-04
Form: 10-Q
Item: Part I, Item 2
Chunk 49
---
 High Prairie Energy Center collapsed, resulting in significantly reduced operation of the energy center. While the investigation into the cause of the collapse is ongoing, a large majority of the turbines at the energy center have returned to operation, and work is ongoing to restore the remaining turbines.

•In late April 2025, the MISO released the results of its annual capacity auction, which included capacity price increases in the central region of the MISO footprint, where Ameren Missouri’s and Ameren Illinois’ service territories are located. Capacity prices increased from $30 per MW-day for the summer of 2024 pursuant to the April 2024 capacity auction to $667 per MW-day for the summer of 2025. Based on estimated power prices and customer demand as of June 30, 2025, the capacity prices set by the April 2025 MISO auction, and the amounts of energy and capacity hedged through IPA procurement events, Ameren Illinois estimates an increase to purchased power costs for calendar year 2025, compared to 2024, of approximately $220 million. The actual increase to purchased power costs will vary due to differences between estimated and realized power prices as well as customer demand satisfied by Ameren Illinois, which will be affected by changes in customers’ elections to use Ameren Illinois or an alternative retail electric supplier for their energy needs. Because of Ameren Illinois’ power procurement riders, the difference between actual purchased power costs and costs billed to customers in a given period is deferred as a regulatory asset or liability. These pass-through costs do not affect Ameren Illinois’ net income, as any change in costs are offset by a corresponding change in revenues. Also, largely due to the higher capacity prices set by the April 2025 MISO auction discussed above and higher capacity prices set by the April 2024 MISO auction for the spring of 2025 in Ameren Missouri’s service territory, Ameren Missouri estimates increases to capacity revenues and purchased power costs for the calendar year 2025, compared to 2024, of approximately $630 million. Ameren Missouri sells nearly all of its capacity to the MISO and purchases the capacity it needs to supply its native load sales from the MISO. Ameren Missouri’s capacity revenues and purchased 

72

power costs are a part of the net energy costs recoverable under the FAC, with 95% of the variance between net energy costs and the amount set in base rates recovered or refunded through the FAC.

•Ameren Missouri and Ameren Illinois continue to make infrastructure