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Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consist of the following: 

2017
	Cost				Accumulated depreciation				Net book value
Generation	$	2,988,569			$	494,912			$	2,493,657
Distribution	5,247,499				483,345				4,764,154
Land	89,935				—				89,935
Equipment and other	143,158				51,026				92,132
Construction in progress
Generation	263,418				—				263,418
Distribution	206,197				—				206,197
	$	8,938,776			$	1,029,283			$	7,909,493

2016
	Cost				Accumulated depreciation				Net book value
Generation	$	2,613,267			$	419,227			$	2,194,040
Distribution	2,638,488				462,454				2,176,034
Land	60,868				—				60,868
Equipment and other	139,961				44,700				95,261
Construction in progress
Generation	197,405				—				197,405
Distribution	166,338				—				166,338
	$	5,816,327			$	926,381			$	4,889,946

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- References

No definition available.

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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