Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Line Items]

Summary of Property, Plant, and Equipment

The following is a summary of DPL’s Property, plant and equipment with corresponding composite depreciation rates at December 31, 2021 and 2020:

	December 31, 2021			December 31, 2020
$ in millions			Composite Rate			Composite Rate
Regulated:
Transmission	$	306.9	3.1%	$	273.0	3.2%
Distribution	1,547.0		4.0%	1,453.7		4.0%
General	34.1		3.2%	17.7		7.6%
Non-depreciable	71.2		N/A	65.1		N/A
Total regulated	1,959.2			1,809.5
Unregulated:
Other	26.5		4.2%	24.8		4.5%
Non-depreciable	4.7		N/A	5.0		N/A
Total unregulated	31.2			29.8
Total property, plant and equipment in service	$	1,990.4	3.7%	$	1,839.3	3.8%

Changes in the Liability for Generation AROs

Changes in the Liability for AROs

	2020
Balance as of January 1	$	4.7
Settlements (a)	(4.7)
Balance as of December 31	$	—

(a)    Settlements related to sale of AES Ohio's Hutchings Coal Station. See Note 15 – Dispositions for more information on the sale of the Hutchings Coal Station.

Changes in the Liability for Transmission and Distribution Asset Removal Costs

Changes in the Regulatory Liability for Transmission and Distribution Asset Removal Costs

	2021		2020
Balance as of January 1	$	138.8	$	143.6
Additions	17.0		15.6
Settlements	(10.6)		(20.4)
Balance as of December 31	$	145.2	$	138.8

THE DAYTON POWER AND LIGHT COMPANY [Member]

Property, Plant and Equipment [Line Items]

Summary of Property, Plant, and Equipment

The following is a summary of AES Ohio’s Property, plant and equipment with corresponding composite depreciation rates at December 31, 2021 and 2020:

	December 31, 2021			December 31, 2020
$ in millions			Composite Rate			Composite Rate
Regulated:
Transmission	$	456.5	2.1%	$	425.5	2.1%
Distribution	1,996.6		3.1%	1,917.0		3.1%
General	48.0		2.3%	29.7		3.6%
Non-depreciable	70.2		N/A	65.1		N/A
Total property, plant and equipment in service	$	2,571.3	2.8%	$	2,437.3	2.8%

Changes in the Liability for Generation AROs

Changes in the Liability for AROs

	2020
Balance at beginning of year	$	4.7
Settlements (a)	(4.7)
Balance at end of year	$	—

(a)    Primarily includes settlement related to transfer of the Hutchings Coal Station. See Note 13 – Dispositions for additional information.

Changes in the Liability for Transmission and Distribution Asset Removal Costs

	2021		2020
Balance at beginning of year	$	138.8	$	143.6
Additions	17.0		15.6
Settlements	(10.6)		(20.4)
Balance at end of year	$	145.2	$	138.8