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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2023
Property, plant and equipment and construction in progress |
Property, plant and equipment and construction in progress | 7. Property, plant and equipment and construction in progress ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Land | ​ | $ | 6,488,400 | ​ | $ | 6,488,400
Buildings | ​ |  | 26,044,551 | ​ |  | 23,280,880
Plant and equipment | ​ |  | 66,000,977 | ​ |  | 64,532,994
Distribution system | ​ |  | 39,546,175 | ​ |  | 39,544,395
Office furniture, fixtures and equipment | ​ |  | 3,338,760 | ​ |  | 3,109,546
Vehicles | ​ |  | 3,433,561 | ​ |  | 2,525,576
Leasehold improvements | ​ |  | 306,545 | ​ |  | 287,980
Lab equipment | ​ |  | 12,456 | ​ |  | 12,456
​ | ​ |  | 145,171,425 | ​ |  | 139,782,227
Less accumulated depreciation | ​ |  | 89,288,904 | ​ |  | 87,252,682
Property, plant and equipment, net | ​ | $ | 55,882,521 | ​ | $ | 52,529,545
Construction in progress | ​ | $ | 495,471 | ​ | $ | 3,705,681
​ As of December 31, 2023, the Company had outstanding capital commitments of approximately $455,000. The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. During the years ended December 31, 2023 and 2022, $7,093,158 and $297,723, respectively, of construction in progress was placed in service. Depreciation expense was $5,823,008 and $5,425,177 for the years ended December 31, 2023 and 2022, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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