Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Public Utilities, Property, Plant and Equipment [Abstract]

Major Classifications Of Property, Plant And Equipment And Accumulated Depreciation [Text Block]

The following table sets forth the major classifications of property, plant, and equipment and accumulated depreciation of continuing operations at December 31:

In thousands	2020		2019
NW Natural:
NGD plant in service	$	3,548,543	$	3,302,049
NGD work in progress	63,901		84,965
Less: Accumulated depreciation	1,055,809		1,017,931
NGD plant, net	2,556,635		2,369,083
Other plant in service	66,300		63,513
Other construction work in progress	5,032		5,548
Less: Accumulated depreciation	19,637		18,662
Other plant, net	51,695		50,399
Total property, plant, and equipment	$	2,608,330	$	2,419,482
Other (NW Holdings):
Other plant in service	$	50,263	$	20,671
Less: Accumulated depreciation	3,823		1,254
Other plant, net	46,440		19,417
NW Holdings:
Total property, plant, and equipment	$	2,654,770	$	2,438,899
NW Natural and NW Holdings:
Capital expenditures in accrued liabilities	$	25,129	$	32,502