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Rate and Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2024
Regulated Operations [Abstract] |
Schedule of Generation Facilities | The following table provides information with respect to each agreement:
| Agreement type | Facility size | Status of MoPSC CCN | Status of FERC approval of acquisition | Anticipated in-service date(a)
Huck Finn Solar Project(b)(c) | Build-transfer | 200-MW | Approved February 2023 | Received March 2023 | Fourth quarter 2024
Boomtown Solar Project(c)(d) | Build-transfer | 150-MW | Approved April 2023 | Received October 2023 | Fourth quarter 2024
Cass County Solar Project(c)(d) | Development-transfer(e) | 150-MW | Approved June 2024 | Not applicable | Fourth quarter 2024
Vandalia Solar Project(f)(g) | Self-build | 50-MW | Approved March 2024 | Not applicable | Fourth quarter 2025
Bowling Green Solar Project(f)(g) | Self-build | 50-MW | Approved March 2024 | Not applicable | First quarter 2026
Split Rail Solar Project(f)(g) | Build-transfer | 300-MW | Approved March 2024 | Received November 2024 | Mid-2026
Castle Bluff Natural Gas Project(f) | Self-build | 800-MW | Approved October 2024(h) | Not applicable | Fourth quarter 2027
(a)Anticipated in-service dates are dependent on the timing of construction completion, among other things. (b)The Huck Finn Solar Project is expected to support Ameren Missouri’s compliance with the state of Missouri’s renewable energy standard. Investments in the project are eligible for recovery under the RESRAM. (c)Ameren Missouri acquired the Cass County, Boomtown, and Huck Finn solar projects in June 2024, September 2024, and October 2024, respectively. These three acquisitions collectively represent a purchase price of approximately $0.9 billion. (d)The Boomtown and Cass County solar projects are expected to support Ameren Missouri’s transition to renewable energy generation and serve customers under the Renewable Solutions Program. (e)The development-transfer agreement included solar panels, project design, land rights, and engineering, procurement, and construction agreements. Ameren Missouri took over construction management of the project when it was acquired in June 2024. (f)These projects collectively represent approximately $1.7 billion of expected capital expenditures. (g)These solar projects are expected to support Ameren Missouri’s transition to renewable energy generation. (h)For additional information see Castle Bluff Natural Gas Project CCN and Post-Construction Cost Deferral below.
Schedule of MYRP details | The following table presents the approved revenue requirements and average annual rate base in the ICC’s June 2024 rehearing order, as well as the proposed revenue requirements and average annual rate base in Ameren Illinois’ September 2024 revised MYRP, the ICC staff’s August 2024 revised MYRP recommendation, and the October 2024 administrative law judges’ proposed order:
Year | Revenue Requirement (in millions) |  |  | Average Annual Rate Base (in billions)
ICC’s June 2024 Rehearing Order(a): |  |  |  |
2024 | $1,196 |  |  | $4.0
2025 | $1,282 |  |  | $4.3
2026 | $1,350 |  |  | $4.5
2027 | $1,397 |  |  | $4.7
Ameren Illinois’ September 2024 Revised MYRP(a): |  |  |  |
2024 | $1,215 |  |  | $4.3
2025 | $1,299 |  |  | $4.5
2026 | $1,385 |  |  | $4.8
2027 | $1,444 |  |  | $5.0
ICC Staff’s August 2024 Revised MYRP(a): |  |  |  |
2024 | $1,206 |  |  | $4.2
2025 | $1,288 |  |  | $4.4
2026 | $1,369 |  |  | $4.6
2027 | $1,424 |  |  | $4.8
Administrative Law Judges’ October 2024 Proposed Order(a): |  |  |  |
2024 | $1,206 |  |  | $4.2
2025 | $1,287 |  |  | $4.4
2026 | $1,370 |  |  | $4.6
2027 | $1,427 |  |  | $4.9
(a)Based on an allowed ROE of 8.72% and a capital structure composed of 50% common equity. The ROE is under appeal, as discussed above.

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