Commitments and Contingencies (Tables)

9 Months Ended

Aug. 31, 2017

Total Minimum Lease and Easement Commitments under Land use Agreements

The total minimum lease and easement commitments at August 31, 2017 under these land use agreements are as follows:

(in thousands)	2017 (remaining three months)		2018		2019		2020		2021		Thereafter		Total
Land use payments	$	406	$	1,329	$	1,686	$	1,742	$	1,782	$	56,411	$	63,356

Summary of Asset Retirement Obligations

The following table summarizes ARO activity for each of the three and nine months ended August 31, 2017 and August 31, 2016, respectively:

	Three Months Ended						Nine Months Ended
(in thousands)	August 31, 2017			August 31, 2016			August 31, 2017		August 31, 2016
Balance at the beginning of the period	$	14,319		$	11,542		$	13,448	$	9,992
ARO assumed in acquisition	279			278			772		1,806
Accretion expense	201			141			558		387
Revisions to ARO during the period	(3		)	(78		)	18		(302		)
Balance at the end of the period	$	14,796		$	11,883		$	14,796	$	11,883

Solar Power System Performance Warranty

Summary of Accrued Warranty Activity

The following table summarizes accrued system output performance warranty activity for the each of three and nine months ended August 31, 2017 and August 31, 2016, respectively:

	Three Months Ended						Nine Months Ended
(in thousands)	August 31, 2017			August 31, 2016			August 31, 2017			August 31, 2016
Balance at the beginning of the period	$	64		$	140		$	196		$	237
Settlements during the period	(16		)	(51		)	(67		)	(207		)
Adjustments during the period	4			110			(77		)	169
Balance at the end of the period	$	52		$	199		$	52		$	199