Income Tax

3 Months Ended

Mar. 31, 2022

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	2022			2021			2022			2021
Income tax at statutory rate (federal)	$	15,783		$	16,808		$	16,115		$	16,939
State income tax	6,513			7,308			6,584			7,325
Increase (decrease):
Differences required to be flowed-through by regulatory commissions	(3,173)			(3,605)			(3,173)			(3,605)
Other, net	(200)			10			(203)			(107)
Total provision for income taxes	$	18,923		$	20,521		$	19,323		$	20,552
Effective income tax rate	25.2		%	25.6		%	25.2		%	25.5		%