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Rate and Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2025
Regulated Operations [Abstract] |
Schedule of Generation Facilities | The following table provides information with respect to each facility:
| Agreement type | Facility size | Status of MoPSC CCN |  | In-service date(a)
Vandalia Solar Project(b) | Self-build | 50-MW | Approved March 2024 |  | Fourth quarter 2025
Bowling Green Solar Project(b) | Self-build | 50-MW | Approved March 2024 |  | First quarter 2026
Split Rail Solar Project(b) | Build-transfer(c) | 300-MW | Approved March 2024 |  | Mid-2026
Castle Bluff Natural Gas Project(d) | Self-build | 800-MW | Approved October 2024 |  | Fourth quarter 2027
Big Hollow Battery Energy Storage Project | Self-build | 400-MW | Filed June 2025(e) |  | Second quarter 2028
Big Hollow Natural Gas Project | Self-build | 800-MW | Filed June 2025(e) |  | Third quarter 2028
Reform Solar Project | Self-build | 250-MW | Filed August 2025(e) |  | Fourth quarter 2028
(a)In-service dates are dependent on the timing of regulatory approvals and construction completion, among other things. (b)These projects collectively represent approximately $0.8 billion of capital expenditures. (c)FERC approval of acquisition received November 2024. (d)This project represents approximately $0.9 billion of capital expenditures. (e)Ameren Missouri expects a decision by the MoPSC in the first half of 2026.

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