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Significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Capitalization of Interest

The AFUDC capitalized that relates to equity funds is recorded as interest, dividend, equity and other income on the consolidated statements of operations. 

	2018				2017
Interest capitalized on non-regulated property	$	1,434			$	4,325
AFUDC capitalized on regulated property:
Allowance for borrowed funds	1,684				1,297
Allowance for equity funds	2,728				2,335
Total	$	5,846			$	7,957

Estimated Useful Lives of Depreciable Assets

The ranges of estimated useful lives and the weighted average useful lives are summarized below:

	Range of useful lives				Weighted average useful lives
	2018		2017		2018		2017
Generation	3 - 60		3 - 60		33		33
Distribution	5 - 100		5 - 100		40		40
Equipment	5 - 43		5 - 43		10		10

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- Definition

Schedule Of Property Plant And Equipment Estimated Useful Lives.

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- Definition

Tabular disclosure of the capitalization of the entity comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (a)(5)
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

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