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3. Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2021
Property, Plant and Equipment [Abstract] |
3. Property, Plant and Equipment | Property, plant and equipment consist of the following:
|  | As of |
|  | March 31, 2021 |  |  | December 31, 2020 |
Land |  | $ | 4,091 |  |  | $ | 4,092 |
Plant and buildings |  |  | 97,249 |  |  |  | 97,398 |
Furniture and fixtures |  |  | 1,191 |  |  |  | 1,195 |
Machinery and equipment |  |  | 5,272 |  |  |  | 5,188 |
Construction in progress |  |  | 30,032 |  |  |  | 25,397 |
Property held for development |  |  | 15,408 |  |  |  | 15,408 |
Finance lease right of use assets |  |  | 2,308 |  |  |  | 2,308 |
Total gross property, plant & equipment |  |  | 155,551 |  |  |  | 150,986 |
Less accumulated depreciation |  |  | (42,461 | ) |  |  | (41,106 | )
Total net property, plant & equipment |  | $ | 113,090 |  |  | $ | 109,880 |
For the three months ended March 31, 2021 and 2020, interest capitalized in property, plant and equipment was $0.6 and $0.1 million, respectively. Construction in progress contains incurred costs for the Biogas Project, Riverbank Project, and Zebrex equipment installation at the Keyes Plant. In the second quarter of 2020, CO₂ Project commenced operations and was placed in service at that time. In the third quarter of 2020, two diary digesters commenced operations and were placed in service at that time. Given there are several ongoing capital projects, their capital expenses have been accumulated in construction in progress and will be capitalized and depreciated once the capital projects are finished and are in service. Depreciation on the components of property, plant and equipment is calculated using the straight-line method over their estimated useful lives as follows:
| Years
Plant and buildings |  | 20 - 30
Machinery and equipment |  | 5 - 15
Furniture and fixtures |  | 3 - 5
For the three months ended March 31, 2021 and 2020, the Company recorded depreciation expense of $1.4 and $1.1 million, respectively. Management is required to evaluate these long-lived assets for impairment whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. Management determined there was no impairment on the long-lived assets during the three months ended March 31, 2021 and 2020.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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