Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2022

Schedule of Regulatory Assets and Liabilities [Table Text Block]

The following table presents DPL’s Regulatory assets and liabilities:

	Type of Recovery	Amortization Through	December 31,
$ in millions			2022		2021
Regulatory assets, current:
Undercollections to be collected through rate riders	A/B	2023	$	38.7	$	23.9
Rate case expenses being recovered in base rates	B	2023	0.5		0.6
Total regulatory assets, current			39.2		24.5
Regulatory assets, non-current:
Pension benefits	B	Ongoing	64.2		76.2
Unrecovered OVEC charges	C		—		28.9
Regulatory compliance costs	B	Undetermined	6.4		6.3
Smart grid and AMI costs	B	2025	2.3		5.2
Unamortized loss on reacquired debt	B	Various	2.0		4.3
Deferred storm costs	A	Undetermined	8.7		15.2
Deferred rate case costs	B	Undetermined	1.9		1.8
Deferred vegetation management and other	A/B	Undetermined	23.0		18.7
Decoupling deferral	C	Undetermined	13.8		13.8
Uncollectible deferral	C	Undetermined	7.5		6.4
Total regulatory assets, non-current			129.8		176.8
Total regulatory assets			$	169.0	$	201.3
Regulatory liabilities, current:
Overcollection of costs to be refunded through rate riders	A/B	2023	$	27.6	$	14.2
Transmission formula rate credits	A	2023	12.8		0.4
Total regulatory liabilities, current			40.4		14.6
Regulatory liabilities, non-current:
Estimated costs of removal - regulated property		Not Applicable	136.8		145.2
Deferred income taxes payable through rates		Various	45.2		57.5
TCJA regulatory liability	B	Ongoing	4.5		6.5
Transmission formula rate credits	A	2024	5.4		12.2
PJM transmission enhancement settlement	A	2025	3.5		5.1
Postretirement benefits	B	Ongoing	3.3		2.8
Total regulatory liabilities, non-current			198.7		229.3
Total regulatory liabilities			$	239.1	$	243.9

A – Recovery of incurred costs plus rate of return.

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

C – Recovery not yet 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	Amortization Through	December 31,
$ in millions			2022		2021
Regulatory assets, current:
Undercollections to be collected through rate riders	A/B	2023	$	38.7	$	23.9
Rate case expenses being recovered in base rates	B	2023	0.5		0.6
Total regulatory assets, current			39.2		24.5
Regulatory assets, non-current:
Pension benefits	B	Ongoing	64.2		76.2
Unrecovered OVEC charges	C		—		28.9
Regulatory compliance costs	B	Undetermined	6.4		6.3
Smart grid and AMI costs	B	2025	2.3		5.2
Unamortized loss on reacquired debt	B	Various	2.0		4.3
Deferred storm costs	A	Undetermined	8.7		15.2
Deferred rate case costs	B	Undetermined	1.9		1.8
Deferred vegetation management and other	A/B	Undetermined	23.0		18.7
Decoupling deferral	C	Undetermined	13.8		13.8
Uncollectible deferral	C	Undetermined	7.5		6.4
Total regulatory assets, non-current			129.8		176.8
Total regulatory assets			$	169.0	$	201.3
Regulatory liabilities, current:
Overcollection of costs to be refunded through rate riders	A/B	2023	$	27.6	$	14.2
Transmission formula rate credits	A	2023	12.8		0.4
Total regulatory liabilities, current			40.4		14.6
Regulatory liabilities, non-current:
Estimated costs of removal - regulated property		Not Applicable	136.8		145.2
Deferred income taxes payable through rates		Various	45.2		57.5
TCJA regulatory liability	B	Ongoing	4.5		6.5
Transmission formula rate credits	A	2024	5.4		12.2
PJM transmission enhancement settlement	A	2025	3.5		5.1
Postretirement benefits	B	Ongoing	3.3		2.8
Total regulatory liabilities, non-current			198.7		229.3
Total regulatory liabilities			$	239.1	$	243.9

A – Recovery of incurred costs plus rate of return.

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

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