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PROPERTY, PLANT, AND EQUIPMENT
9 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT, AND EQUIPMENT
4. PROPERTY, PLANT, AND EQUIPMENT
Property, plant and equipment, net as of September 30, 2025 and December 31, 2024 consist of the following (in thousands):
September 30, 2025 (As Restated)
December 31, 2024Estimated Useful Lives
Land and improvements1
$21,769 $17,215 
20 years
Building and improvements
209,710 186,267 
10 to 39 years
Mining and network equipment
389,971 413,296 
3 to 5 years
Electrical equipment
73,949 74,077 
15 years
Other property, plant and equipment
2,967 2,764 
5 to 7 years
Total
698,366 693,619 
Less: accumulated depreciation and amortization
401,237 372,112 
Total
297,129 321,507 
Add: Construction in progress
656,996 111,966 
Property, plant and equipment, net
$954,125 $433,473 
1 Estimated useful life of improvements. Land is not depreciated.
Depreciation expense for the three months ended September 30, 2025 and 2024, was $16.1 million and $28.5 million, respectively, and for the nine months ended September 30, 2025 and 2024, was $54.3 million and $86.6 million, respectively.
During the three months ended September 30, 2025 and 2024, $35.4 million and $0.4 million, respectively, of construction in progress was placed into service. During the nine months ended September 30, 2025 and 2024, $47.5 million and $140.3 million, respectively, of construction in progress was placed into service.