Property, Plant, and Equipment, Net

9 Months Ended

Sep. 30, 2022

Property, Plant, and Equipment, Net [Abstract]

Property, Plant, and Equipment, Net

5. Property, Plant, and Equipment, Net

Property, plant, and equipment, net, consisted of the following as of September 30, 2022 and December 31, 2021:

	September 30, 2022			December 31, 2021
Plant and equipment	$	203,382		$	161,387
CNG/RNG fueling stations		34,494			27,892
Construction in progress		102,205			62,616
Buildings		2,585			2,544
Land		1,303			1,303
Service equipment		1,692			1,521
Leasehold improvements		815			815
Vehicles		313			407
Office furniture and equipment		307			302
Computer software		277			277
Other		458			416
		347,831			259,480
Less: accumulated depreciation		(97,476	)		(89,710	)
Property, plant, and equipment, net	$	250,355		$	169,770

As of September 30, 2022, there has been an increase in property, plant and equipment as a result of an increase in the construction of RNG generation facilities including, but not limited to Emerald, Sapphire, and Central Valley RNG dispensing facilities. The majority of these facilities, for which costs are in construction in progress as of September 30, 2022, are expected to be operational during the fourth quarter of 2023 and early 2024.

Depreciation expense on property, plant, and equipment for the nine months ended September 30, 2022 and September 30, 2021 was $8,986 and $6,163, respectively.