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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Public Utility Property, Plant, and Equipment [Table Text Block]
The following table sets forth the major classifications of property, plant, and equipment and accumulated depreciation of continuing operations:
September 30,December 31,
In thousands202020192019
NW Natural:
NGD plant in service$3,441,301 $3,236,227 $3,302,049 
NGD work in progress120,722 91,302 84,965 
Less: Accumulated depreciation1,051,018 1,007,742 1,017,931 
NGD plant, net2,511,005 2,319,787 2,369,083 
Other plant in service65,103 63,360 63,513 
Other construction work in progress6,444 6,164 5,548 
Less: Accumulated depreciation19,387 18,889 18,662 
Other plant, net52,160 50,635 50,399 
Total property, plant, and equipment, net$2,563,165 $2,370,422 $2,419,482 
Other (NW Holdings):
Other plant in service$47,302 $19,665 $20,671 
Less: Accumulated depreciation3,218 699 1,254 
Other plant, net$44,084 $18,966 $19,417 
NW Holdings:
Total property, plant, and equipment, net$2,607,249 $2,389,388 $2,438,899 
NW Natural and NW Holdings:
Capital expenditures in accrued liabilities$37,236 $35,461 $32,502