Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Carrying value and future principal payments of long-term debt

The carrying value and future principal payments of NEP’s long-term debt consist of the following:

													Total Carrying Value
	2015		2016		2017		2018		2019		Thereafter		2014		2013
	(millions)
Canyon Wind:
Term loan—maturing 2030—LIBOR(a) + 2.25—3.25%	$	12	$	12	$	12	$	12	$	12	$	151	$	211	$	223
Mountain Prairie:
Senior secured notes—maturing 2030—6.56%	9		10		11		12		14		226		282		289
Genesis:
Project note—maturing 2038—4.125%	—		—		—		—		—		402		402		702
Bank loan—maturing 2019(b)—LIBOR(a) +1.2—1.3%	37		38		38		—		—		—		113		135
Senior secured notes—maturing 2038—5.60%	—		—		—		26		27		227		280		—
St. Clair:
Canadian dollar denominated Senior secured notes—maturing 2031—4.881%	7		8		8		8		8		96		135		155
Trillium:
Canadian dollar denominated Senior secured notes—maturing 2033—5.803%	7		9		9		10		10		222		267		295
Stateline:
Bank loan—maturing 2017(c)—LIBOR(a) +1.75—2.125%	6		7		9		—		—		—		22		28
Baldwin:
Senior secured notes—maturing 2031—6.25%	2		3		3		3		4		60		75		78
Bluewater:
Canadian dollar denominated term loan—maturing 2032—CDOR(d) + 2.00—3.25%	6		6		6		6		6		116		146		—
Less: Total current maturities of long-term debt													86		378
Total long-term debt	$	86	$	93	$	96	$	77	$	81	$	1,500	$	1,847	$	1,527

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(a) LIBOR, London InterBank Offered Rate, is three-month LIBOR for Canyon Wind and Stateline and six-month LIBOR for Genesis.

(b) Principal payments represent accelerated payment schedule under the Bank loan to the extent Genesis has sufficient available cash, which would result in the repayment in full by August 2017.

(c) Stateline bank loan was repaid in July 2015. See below.

(d) CDOR, Canadian Dealer Offered Rate.