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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment, net |
Property, Plant and Equipment, net | 7. Property, Plant and Equipment, net Property, plant and equipment, net is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) | ​ | 2023 | ​ | 2022
Compression equipment, facilities and other fleet assets | ​ | $ | 3,326,919 | ​ | $ | 3,234,239
Land and buildings | ​ |  | 30,169 | ​ |  | 44,304
Transportation and shop equipment | ​ |  | 100,474 | ​ |  | 93,189
Computer hardware and software | ​ |  | 77,532 | ​ |  | 77,357
Other | ​ |  | 5,678 | ​ |  | 5,754
Property, plant and equipment | ​ |  | 3,540,772 | ​ |  | 3,454,843
Accumulated depreciation | ​ |  | (1,238,790) | ​ |  | (1,255,590)
Property, plant and equipment, net | ​ | $ | 2,301,982 | ​ | $ | 2,199,253
​ Depreciation expense was $159.3 million, $155.4 million and $167.6 million during the years ended December 31, 2023, 2022 and 2021, respectively. Assets under construction of $64.7 million and $92.5 million at December 31, 2023 and 2022, respectively, primarily consisted of compression equipment, facilities and other fleet assets.

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