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Significant Events - Kent Hills 3 Wind Project (Details) - Kent Hills 3 Wind Project	3 Months Ended
	Jun. 30, 2017 MW
Investment [Line Items]
Capacity of facility (in megawatts)	167
New Brunswick Power Corporation
Investment [Line Items]
Increase in contractual power capacity (in megawatts)	17.25

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- Definition

Capacity Of Generation Units, Power

+ References

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- Definition

Increase (Decrease) in Contractual Power Capacity, Power

+ References

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