Rate and Regulatory Matters (Tables)

9 Months Ended

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.