Depreciation is computed using the straight‑line method over the estimated useful lives of the assets as follows:
Plant and equipment
5 - 30 years
CNG/RNG Fueling Stations
10 - 20 years
Construction in progressN/A
Buildings
40 years
LandN/A
Service equipment
5 - 10 years
Leasehold improvementsshorter of lease term or useful life
Vehicles
7 years
Office furniture and equipment
5 - 7 years
Computer software
3 years
Land lease - finance leaseLease term
Vehicles - finance leaseshorter of lease term or useful life
Other
7 years
Property, plant, and equipment, net, consisted of the following as of December 31, 2025 and 2024:
December 31,
2025
December 31,
2024
Plant and equipment$322,123 $317,926 
Construction in progress203,312 169,571 
CNG/RNG fueling stations (1)
90,453 68,899 
Finance leases2,725 9,550 
Other10,064 9,688 
628,677 575,634 
Less: accumulated depreciation (2)
(133,043)(117,376)
Property, plant, and equipment, net$495,634 $458,258 
(1) Includes $87,888 and $68,899 lessor operating lease right of use assets as of December 31, 2025 and 2024, respectively.
(2) Includes $18,399 and $14,569 lessor operating lease accumulated depreciation for the years ended December 31, 2025 and 2024, respectively.

Historical Timeline

Fiscal YearFiled
2025Mar 16, 2026Showing above
2024Mar 17, 2025
2023Mar 15, 2024
2022Mar 29, 2023

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.