Commitments and Contingencies (Tables)

3 Months Ended

Feb. 28, 2018

Total Minimum Lease and Easement Commitments under Land use Agreements

The total minimum lease and easement commitments at February 28, 2018 under these land use agreements are as follows:

(in thousands)	2018 (remaining nine months)		2019		2020		2021		2022		Thereafter		Total
Land use payments	$	899	$	1,686	$	1,742	$	1,782	$	1,822	$	54,590	$	62,521

Summary of Asset Retirement Obligations

The following table summarizes ARO activities:

	Three Months Ended
(in thousands)	February 28, 2018		February 28, 2017
Balance at the beginning of the period	$	14,970	$	13,448
Accretion expense	208		171
ARO assumed in acquisition	—		493
Revisions to ARO during the period	—		17
Balance at the end of the period	$	15,178	$	14,129

Solar Power System Performance Warranty

Summary of Accrued Warranty Activity

	Three Months Ended
(in thousands)	February 28, 2018			February 28, 2017
Balance at the beginning of the period	$	45		$	196
Settlements during the period	(2		)	(29		)
Adjustments during the period	(13		)	(29		)
Balance at the end of the period	$	30		$	138