XML 53 R36.htm IDEA: XBRL DOCUMENT v3.8.0.1

Significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2017

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. 

	2017				2016
Interest capitalized on non-regulated property	$	5,558			$	3,259
AFUDC capitalized on regulated property:
Allowance for borrowed funds	1,673				1,167
Allowance for equity funds	3,014				2,774
Total	$	10,245			$	7,200

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
	2017		2016		2017		2016
Generation	3 - 60		3 - 60		33		32
Distribution	5 - 100		5 - 100		40		41
Equipment	5 - 50		5 - 50		13		11

X

- Definition

Schedule Of Property Plant And Equipment Estimated Useful Lives.

+ References

No definition available.

+ Details

Name:	aqunf_ScheduleOfPropertyPlantAndEquipmentEstimatedUsefulLivesTableTableTextBlock
Namespace Prefix:	aqunf_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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.

+ References

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

+ Details

Name:	us-gaap_ScheduleOfCapitalizationTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration