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Property, plant and equipment, net
 12 Months Ended
Dec. 31, 2021
Property, plant and equipment, net [Abstract]  
Property, plant and equipment, net
9.  Property, plant and equipment, net

Our property, plant and equipment, net, consisted of the following:

   
December 31, 2021
    
December 31, 2020
  
Land, Buildings & Leasehold Improvements
  
$
1,888,438
      
15,883
  
Machinery
    
8,756,437
      
561,928
  
Equipment
    
4,090,534
      
113,222
  
Assets under construction
    
430,455
      
-
  
   
$
15,165,864
    
$
691,033
  
Less: accumulated depreciation
    
(6,580,876
)
    
(492,296
)
Total
  
$
8,584,988
    
$
198,737
  

Upon acquisition of UltraCell LLC, the Company acquired property and equipment with a net book value of $0.01 million. Upon acquisition of SerEnergy and FES, the Company acquired property and equipment with a net book value of $5.36 million. During the year ended December 31, 2021, additions to property, plant and equipment of $3.9 million include leasehold improvements, machinery, office and other equipment and assets under construction.

Assets under construction mainly relate to the design and construction of Company’s leased premises at Hood Park in Charlestown, as discussed in Note 7. Completed assets are transferred to their respective asset classes, and depreciation begins when an asset is ready for its intended use. During the year ended December 31, 2021 an amount of $0.3 million was transferred from assets under construction to machinery and equipment.

Depreciation expense during the years ended December 31, 2021 and 2020 was $0.56 million and $0.02 million respectively.

There are no collaterals or other commitments on the Company’s property, plant and equipment.