Income Tax

3 Months Ended

Mar. 31, 2023

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate varied from the federal statutory rate due to the following:

	Three Months Ended March 31,
	NW Holdings						NW Natural
In thousands	2023			2022			2023			2022
Income tax at statutory rate (federal)	$	20,332		$	15,783		$	21,412		$	16,115
State income tax	8,149			6,513			8,406			6,584
Increase (decrease):
Differences required to be flowed-through by regulatory commissions	(2,909)			(3,173)			(2,909)			(3,173)
Other, net	(425)			(200)			(487)			(203)
Total provision for income taxes	$	25,147		$	18,923		$	26,422		$	19,323
Effective income tax rate	26.0		%	25.2		%	25.9		%	25.2		%