Rate and Regulatory Matters (Tables)

6 Months Ended

Jun. 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(e)
Cass County Solar Project(d)	Development-transfer(f)	150-MW	Approved June 2024	Not applicable	Fourth quarter 2024
Vandalia Solar Project(c)(g)	Self-build	50-MW	Approved March 2024	Not applicable	Fourth quarter 2025
Bowling Green Solar Project(c)(g)	Self-build	50-MW	Approved March 2024	Not applicable	First quarter 2026
Split Rail Solar Project(g)	Build-transfer	300-MW	Approved March 2024	Requested July 2024	Mid-2026
Castle Bluff Natural Gas Project	Self-build	800-MW	Filed June 2024	Not applicable	Fourth quarter 2027

(a)Anticipated in-service dates are dependent on the timing of regulatory approvals and 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 will be eligible for recovery under the RESRAM. Ameren Missouri expects to close on the acquisition of the Huck Finn Solar Project in the fourth quarter of 2024.

(c)These projects collectively represent approximately $0.85 billion of expected capital expenditures.

(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)Ameren Missouri expects to close on the acquisition of the Boomtown Solar Project in August 2024.

(f)In June 2024, Ameren Missouri acquired the Cass County Solar Project, which includes solar panels, project design, land rights, and engineering, procurement, and construction agreements, for approximately $250 million and took over construction management of the project.

(g)These solar projects are expected to support Ameren Missouri’s transition to renewable energy generation.

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’ July 2024 revised MYRP and the ICC staff’s July 2024 revised MYRP recommendation:

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’ July 2024 Revised MYRP(a):
2024	$1,215	$4.3
2025	$1,300	$4.5
2026	$1,386	$4.8
2027	$1,446	$5.0
ICC Staff’s July 2024 Revised MYRP(a):
2024	$1,201	$4.2
2025	$1,281	$4.4
2026	$1,361	$4.6
2027	$1,414	$4.8

(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.