Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2024

Schedule of Regulatory Assets and Liabilities [Table Text Block]

The following table presents AES Ohio’s regulatory assets and liabilities:

	Type of Recovery	Recovery Period	December 31,
$ in millions			2024		2023
Regulatory assets, current:
Undercollections to be collected through rate riders	A/B/D	2025	$	63.4	$	51.7
Uncollectible expense being recovered in base rates	B	2025	1.7		1.7
Vegetation management being recovered in base rates	B	2025	2.7		2.7
Rate case expenses being recovered in base rates	B	2025	0.4		0.5
Transmission formula rate debits	A	2025	13.8		—
Total regulatory assets, current			82.0		56.6
Regulatory assets, non-current:
Pension benefits	A	Ongoing	58.8		62.6
Regulatory compliance costs	A	2028	33.2		45.0
Energy efficiency	A/B/D	Undetermined	4.1		4.1
Smart grid and AMI costs	C	Undetermined	1.8		3.2
Unamortized loss on reacquired debt	B	Ongoing	0.5		1.1
Deferred storm costs	B	2025	—		2.2
Deferred rate case costs	B/D	Undetermined	2.4		1.5
Deferred vegetation management	B	2028	21.7		19.9
CIS replacement	D	Undetermined	8.8		3.1
Transmission formula rate debits	A	2026	1.2		6.7
Customer Program Rider	A/D	Undetermined	2.9		—
Uncollectible deferral	B	2028	4.6		6.3
Total regulatory assets, non-current			140.0		155.7
Total regulatory assets			$	222.0	$	212.3
Regulatory liabilities, current:
Overcollection of costs to be refunded through rate riders	A/B	2025	$	9.3	$	14.7
Transmission formula rate credits	A	2025	1.0		3.3
Total regulatory liabilities, current			10.3		18.0
Regulatory liabilities, non-current:
Estimated costs of removal - regulated property		Not Applicable	131.0		134.2
Deferred income taxes payable through rates		Ongoing	35.0		42.6
TCJA regulatory liability	B	Ongoing	—		1.0
Transmission formula rate credits	A	2026	1.5		—
PJM transmission enhancement settlement	B	2025	—		1.7
Postretirement benefits	B	Ongoing	1.9		2.6
Total regulatory liabilities, non-current			169.4		182.1
Total regulatory liabilities			$	179.7	$	200.1

A – Recovery of incurred costs plus rate of return. Refund of incurred credits, plus rate of return.

B – Recovery of incurred costs without a rate of return. Refund of incurred credits without a rate of return.

C – Includes costs associated with Smart Grid Phase 2 development for which recovery is not yet determined but is considered probable of occurring in future rate proceedings.

D – Recovery not determined, but recovery is probable of occurring in future rate proceedings.

Subsidiaries [Member]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

The following table presents AES Ohio’s regulatory assets and liabilities:

	Type of Recovery	Recovery Period	December 31,
$ in millions			2024		2023
Regulatory assets, current:
Undercollections to be collected through rate riders	A/B/D	2025	$	63.4	$	51.7
Uncollectible expense being recovered in base rates	B	2025	1.7		1.7
Vegetation management being recovered in base rates	B	2025	2.7		2.7
Rate case expenses being recovered in base rates	B	2025	0.4		0.5
Transmission formula rate debits	A	2025	13.8		—
Total regulatory assets, current			82.0		56.6
Regulatory assets, non-current:
Pension benefits	A	Ongoing	58.8		62.6
Regulatory compliance costs	A	2028	33.2		45.0
Energy efficiency	A/B/D	Undetermined	4.1		4.1
Smart grid and AMI costs	C	Undetermined	1.8		3.2
Unamortized loss on reacquired debt	B	Ongoing	0.5		1.1
Deferred storm costs	B	2025	—		2.2
Deferred rate case costs	B/D	Undetermined	2.4		1.5
Deferred vegetation management	B	2028	21.7		19.9
CIS replacement	D	Undetermined	8.8		3.1
Transmission formula rate debits	A	2026	1.2		6.7
Customer Program Rider	A/D	Undetermined	2.9		—
Uncollectible deferral	B	2028	4.6		6.3
Total regulatory assets, non-current			140.0		155.7
Total regulatory assets			$	222.0	$	212.3
Regulatory liabilities, current:
Overcollection of costs to be refunded through rate riders	A/B	2025	$	9.3	$	14.7
Transmission formula rate credits	A	2025	1.0		3.3
Total regulatory liabilities, current			10.3		18.0
Regulatory liabilities, non-current:
Estimated costs of removal - regulated property		Not Applicable	131.0		134.2
Deferred income taxes payable through rates		Ongoing	35.0		42.6
TCJA regulatory liability	B	Ongoing	—		1.0
Transmission formula rate credits	A	2026	1.5		—
PJM transmission enhancement settlement	B	2025	—		1.7
Postretirement benefits	B	Ongoing	1.9		2.6
Total regulatory liabilities, non-current			169.4		182.1
Total regulatory liabilities			$	179.7	$	200.1

A – Recovery of incurred costs plus rate of return. Refund of incurred credits, plus rate of return.

B – Recovery of incurred costs without a rate of return. Refund of incurred credits without a rate of return.

C – Includes costs associated with Smart Grid Phase 2 development for which recovery is not yet determined but is considered probable of occurring in future rate proceedings.

D – Recovery not determined, but recovery is probable of occurring in future rate proceedings.