Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment, Net [Abstract]

Property, Plant and Equipment

Dominion's nonutility property, plant and equipment is depreciated using the straight-line method over the following estimated useful lives:

Asset	Estimated Useful Lives
Merchant generation-nuclear	44 years
Merchant generation-other	15-36 years
Nonutility gas gathering and processing	3-50 years
General and other	5-59 years

Major classes of property, plant and equipment and their respective balances for the Companies are as follows:

At December 31,	2016		2015
(millions)
Dominion
Utility:
Generation	$	17,147	$	15,656
Transmission	14,315		11,461
Distribution	16,381		13,128
Storage	2,814		2,460
Nuclear fuel	1,537		1,464
Gas gathering and processing	216		799
Oil and gas	1,652		—
General and other	1,450		927
Plant under construction	6,254		5,550
Total utility	61,766		51,445
Nonutility:
Merchant generation-nuclear	1,419		1,339
Merchant generation-other	4,149		2,683
Nuclear fuel	897		938
Gas gathering and processing	619		—
Other-including plant under construction	706		1,371
Total nonutility	7,790		6,331
Total property, plant and equipment	$	69,556	$	57,776
Virginia Power
Utility:
Generation	$	17,147	$	15,656
Transmission	7,871		6,963
Distribution	10,573		10,048
Nuclear fuel	1,537		1,464
General and other	745		709
Plant under construction	2,146		2,793
Total utility	40,019		37,633
Nonutility-other	11		6
Total property, plant and equipment	$	40,030	$	37,639
Dominion Gas
Utility:
Transmission	$	4,231	$	3,804
Distribution	3,019		2,765
Storage	1,627		1,583
Gas gathering and processing	198		797
General and other	184		165
Plant under construction	448		443
Total utility	9,707		9,557
Nonutility:
Gas gathering and processing	$	619	$	—
Other-including plant under construction	149		136
Total nonutility	768		136
Total property, plant and equipment	$	10,475	$	9,693

Share of Jointly-Owned Power Stations

Dominion's and Virginia Power's proportionate share of jointly-owned power stations at December 31, 2016 is as follows:

	Bath County Pumped Storage Station(1)			North Anna Units 1 and 2(1)			Clover Power Station(1)			Millstone Unit 3(2)
(millions, except percentages)
Ownership interest	60		%	88.4		%	50		%	93.5		%
Plant in service	$	1,052		$	2,520		$	586		$	1,190
Accumulated depreciation	(585		)	(1,210		)	(219		)	(349		)
Nuclear fuel	—			718			—			469
Accumulated amortization of nuclear fuel	—			(549		)	—			(366		)
Plant under construction	8			69			4			51

(1) Units jointly owned by Virginia Power.

(2) Unit jointly owned by Dominion.