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Property, plant and equipment and construction in progress | 12 Months Ended
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Dec. 31, 2024
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,
​ |  | 2024 |  | 2023
Land | ​ | $ | 6,307,089 | ​ | $ | 6,488,400
Buildings | ​ |  | 26,033,866 | ​ |  | 26,044,551
Plant and equipment | ​ |  | 61,089,877 | ​ |  | 66,000,977
Distribution system | ​ |  | 40,402,691 | ​ |  | 39,546,175
Office furniture, fixtures and equipment | ​ |  | 3,277,313 | ​ |  | 3,338,760
Vehicles | ​ |  | 3,830,539 | ​ |  | 3,433,561
Leasehold improvements | ​ |  | 306,545 | ​ |  | 306,545
Lab equipment | ​ |  | 12,456 | ​ |  | 12,456
​ | ​ |  | 141,260,376 | ​ |  | 145,171,425
Less accumulated depreciation | ​ |  | 88,828,094 | ​ |  | 89,288,904
Property, plant and equipment, net | ​ | $ | 52,432,282 | ​ | $ | 55,882,521
Construction in progress | ​ | $ | 5,143,717 | ​ | $ | 495,471
​ The Company maintains insurance for loss or damage to all fixed assets that it deems susceptible to loss. During the years ended December 31, 2024, and 2023, $1,395,485 and $7,093,158, respectively, of construction in progress was placed in service. Depreciation expense was $5,855,935, $5,823,008 and $5,425,177 for the years ended December 31, 2024, 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/1943274/2147477798/958-360-50-6 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/1943274/2147477798/958-360-50-1 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/1943274/2147477798/958-360-50-7 + Details
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