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Energy Assets, Net
 6 Months Ended
Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Energy Assets, Net ENERGY ASSETS, NET
Energy assets, net consisted of the following:
 June 30, 2021December 31, 2020
Energy assets (1)
$1,044,288 $954,426 
Less - accumulated depreciation and amortization(245,679)(225,048)
Energy assets, net$798,609 $729,378 
(1) Includes financing lease assets (see Note 6), capitalized interest and ARO assets (see tables below).
The following table sets forth our depreciation and amortization expense on energy assets, net of deferred grant amortization:
Three Months Ended June 30,Six Months Ended June 30,
Location2021202020212020
Cost of revenues (2)
$10,450 $9,650 $20,136 $18,949 
(2) Includes depreciation and amortization on financing lease assets (see Note 6).
The following table presents the interest costs relating to construction financing during the period of construction, which were capitalized as part of energy assets, net:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Capitalized interest$1,288 $912 $3,526 $1,774 

The following tables sets forth information related to our Asset Retirement Obligations (“ARO”) assets and ARO liabilities:
LocationJune 30, 2021December 31, 2020
ARO assets, netEnergy assets, net$2,004 $1,468 
ARO liabilities, currentAccrued expenses and other current liabilities$6 $86 
ARO liabilities, non-currentOther liabilities2,284 1,561 
Total ARO liabilities$2,290 $1,647 

Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Depreciation expense of ARO assets$30 $19 $53 $38 
Accretion expense of ARO liabilities$33 $22 $57 $43