Income Tax

3 Months Ended

Mar. 31, 2024

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	2024			2023			2024			2023
Income tax at statutory rate (federal)	$	18,514		$	20,332		$	19,579		$	21,412
State income tax	7,577			8,149			7,849			8,406
Increase (decrease):
Differences required to be flowed-through by regulatory commissions	(1,579)			(2,909)			(1,580)			(2,909)
Other, net	(173)			(425)			(175)			(487)
Total provision for income taxes	$	24,339		$	25,147		$	25,673		$	26,422
Effective income tax rate	27.6		%	26.0		%	27.5		%	25.9		%