Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Table Text Block]

A summary of property, plant and equipment for continuing operations by classification as of December 31, 2021 and 2020 is provided in the following table:


	As of December 31,
(in thousands)	2021		2020
Property, plant and equipment
Regulated Energy
Natural gas distribution - Delmarva Peninsula and Florida	$	859,627	$	782,329
Natural gas transmission - Delmarva Peninsula, Pennsylvania and Florida	727,277		667,538
Electric distribution	133,383		127,710
Unregulated Energy
Propane operations – Mid-Atlantic, North Carolina, South Carolina and Florida	176,095		151,258
Natural gas transmission and supply – Ohio	112,050		87,962
Electricity and steam generation	36,740		36,521
Mobile CNG and pipeline solutions	32,374		24,905

Other	35,418		30,769
Total property, plant and equipment	2,112,964		1,908,992
Less: Accumulated depreciation and amortization	(417,479)		(368,743)
Plus: Construction work in progress	49,393		60,929
Net property, plant and equipment	$	1,744,878	$	1,601,178

Annual Depreciation Rates Table [Table Text Block]

Depreciation and Accretion Included in Operations Expenses

We compute depreciation expense for our regulated operations by applying composite, annual rates, as approved by the respective regulatory bodies. The following table shows the average depreciation rates used for regulated operations during the years ended December 31, 2021, 2020 and 2019:


	2021	2020	2019
Natural gas distribution – Delmarva Peninsula	2.5%	2.5%	2.5%
Natural gas distribution – Florida	2.5%	2.5%	2.6%
Natural gas transmission – Delmarva Peninsula	2.7%	2.7%	2.6%
Natural gas transmission – Florida	2.3%	2.3%	2.4%
Electric distribution	2.8%	2.9%	3.4%

Estimated Useful Life Of Assets Table [Table Text Block]

For our unregulated operations, we compute depreciation expense on a straight-line basis over the following estimated useful lives of the assets:


Asset Description			Useful Life
Propane distribution mains			10-37 years
Propane bulk plants and tanks			10-40 years
Propane equipment, meters and meter installations			5-33 years
Measuring and regulating station equipment			5-37 years
Natural gas pipelines			45 years
Natural gas right of ways			Perpetual
CHP plant			30 years
Natural gas processing equipment			20-25 years
Office furniture and equipment			3-10 years
Transportation equipment			4-20 years
Structures and improvements			5-45 years
Other			Various