Property, Plant and Equipment

12 Months Ended

Dec. 31, 2021

Public Utilities, Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Text Block]

PROPERTY, PLANT, AND EQUIPMENT

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

In thousands	2021		2020
NW Natural:
NGD plant in service	$	3,721,939	$	3,548,543
NGD work in progress	135,398		63,901
Less: Accumulated depreciation	1,098,715		1,055,809
NGD plant, net	2,758,622		2,556,635
Other plant in service	69,332		66,300
Other construction work in progress	4,971		5,032
Less: Accumulated depreciation	20,646		19,637
Other plant, net	53,657		51,695
Total property, plant, and equipment	$	2,812,279	$	2,608,330
Other (NW Holdings):
Other plant in service	$	65,603	$	50,263
Less: Accumulated depreciation	6,512		3,823
Other plant, net	59,091		46,440
NW Holdings:
Total property, plant, and equipment	$	2,871,370	$	2,654,770
NW Natural:
Capital expenditures in accrued liabilities	$	37,537	$	25,129
NW Holdings:
Capital expenditures in accrued liabilities	$	38,333	$	25,129

Accumulated depreciation does not include the accumulated provision for asset removal costs of $446.0 million and $428.0 million at December 31, 2021 and 2020, respectively. These accrued asset removal costs are reflected on the balance sheet as regulatory liabilities. See Note 2.

NW Holdings

Other plant balances include long-lived assets associated with water operations and non-regulated activities not held by NW Natural or its subsidiaries.

NW Natural

Other plant balances include non-utility gas storage assets at the Mist facility and other long-lived assets not related to NGD.

The weighted average depreciation rate for NGD assets was 3.0% in 2021, 3.0% in 2020, and 2.9% in 2019. The weighted average depreciation rate for assets not related to NGD was 1.8% in 2021, 1.8% in 2020, and 1.8% in 2019.