Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2021

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			2021		2020
Regulatory assets, current:
Undercollections to be collected through rate riders	A/B	2022	$	23.9	$	26.8
Rate case expenses being recovered in base rates	B	2022	0.6		0.7
Total regulatory assets, current			24.5		27.5
Regulatory assets, non-current:
Pension benefits	B	Ongoing	76.2		94.4
Unrecovered OVEC charges	C	Undetermined	28.9		28.9
Regulatory compliance costs	B	Undetermined	6.3		6.3
Smart grid and AMI costs	B	2026	5.2		8.5
Unamortized loss on reacquired debt	B	Various	4.3		7.1
Deferred storm costs	A	Undetermined	15.2		11.5
Deferred rate case costs	B	Undetermined	1.8		—
Deferred vegetation management and other	A/B	Undetermined	18.7		15.7
Decoupling deferral	C	Undetermined	13.8		13.8
Uncollectible deferral	C	Undetermined	6.4		7.4
Total regulatory assets, non-current			176.8		193.6
Total regulatory assets			$	201.3	$	221.1
Regulatory liabilities, current:
Overcollection of costs to be refunded through rate riders	A/B	2022	$	14.2	$	18.0
Transmission formula rate credits	A	2022	$	0.4	$	—
Total regulatory liabilities, current			14.6		18.0
Regulatory liabilities, non-current:
Estimated costs of removal - regulated property		Not Applicable	145.2		138.8
Deferred income taxes payable through rates		Various	57.5		61.2
TCJA regulatory liability	B	Ongoing	6.5		7.2
Transmission formula rate credits	A	2023	12.2		—
PJM transmission enhancement settlement	A	2025	5.1		7.0
Postretirement benefits	B	Ongoing	2.8		4.1
Total regulatory liabilities, non-current			229.3		218.3
Total regulatory liabilities			$	243.9	$	236.3

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			2021		2020
Regulatory assets, current:
Undercollections to be collected through rate riders	A/B	2022	$	23.9	$	26.8
Rate case expenses being recovered in base rates	B	2022	0.6		0.7
Total regulatory assets, current			24.5		27.5
Regulatory assets, non-current:
Pension benefits	B	Ongoing	76.2		94.4
Unrecovered OVEC charges	C	Undetermined	28.9		28.9
Regulatory compliance costs	B	Undetermined	6.3		6.3
Smart grid and AMI costs	B	2026	5.2		8.5
Unamortized loss on reacquired debt	B	Various	4.3		7.1
Deferred storm costs	A	Undetermined	15.2		11.5
Deferred rate case costs	B	Undetermined	1.8		—
Deferred vegetation management and other	A/B	Undetermined	18.7		15.7
Decoupling deferral	C	Undetermined	13.8		13.8
Uncollectible deferral	C	Undetermined	6.4		7.4
Total regulatory assets, non-current			176.8		193.6
Total regulatory assets			$	201.3	$	221.1
Regulatory liabilities, current:
Overcollection of costs to be refunded through rate riders	A/B	2022	$	14.2	$	18.0
Transmission formula rate credits	A	2022	0.4		—
Total regulatory liabilities, current			14.6		18.0
Regulatory liabilities, non-current:
Estimated costs of removal - regulated property		Not Applicable	145.2		138.8
Deferred income taxes payable through rates		Various	57.5		61.2
TCJA regulatory liability	B	Ongoing	6.5		7.2
Transmission formula rate credits	A	2023	12.2		—
PJM transmission enhancement settlement	A	2025	5.1		7.0
Postretirement benefits	B	Ongoing	2.8		4.1
Total regulatory liabilities, non-current			229.3		218.3
Total regulatory liabilities			$	243.9	$	236.3

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.