Property, Plant and Equipment

12 Months Ended

Dec. 31, 2023

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	2023		2022
NW Natural:
NGD plant in service	$	4,206,455	$	3,992,676
NGD construction work in progress	105,166		78,897
Less: Accumulated depreciation	1,159,367		1,115,690
NGD plant, net	3,152,254		2,955,883
Other plant in service	71,175		70,368
Other construction work in progress	10,963		6,606
Less: Accumulated depreciation	22,595		21,541
Other plant, net	59,543		55,433
Total property, plant, and equipment	$	3,211,797	$	3,011,316
Other (NW Holdings):
Other plant in service	$	147,040	$	92,979
Other construction work in progress	15,810		20,040
Less: Accumulated depreciation	16,593		9,935
Other plant, net	146,257		103,084
NW Holdings:
Total property, plant, and equipment	$	3,358,054	$	3,114,400
NW Natural:
Capital expenditures in accrued liabilities	$	24,168	$	24,584
NW Holdings:
Capital expenditures in accrued liabilities	$	27,879	$	25,318

Accumulated depreciation does not include the accumulated provision for asset removal costs of $496.2 million and $467.7 million at December 31, 2023 and 2022, 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 and wastewater 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 2023, 2022, and 2021. The weighted average depreciation rate for assets not related to NGD was 1.7% in 2023 and 1.8% in 2022 and 2021.