Debt (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Maturities of Long-term Debt [Table Text Block]

Retirement of long-term debt for each of the annual periods through December 31, 2026 and thereafter are as follows:


In thousands	Long-term debt maturities
NW Natural:
2022	$	—
2023	90,000
2024	—
2025	30,000
2026	55,000
Thereafter	819,700
Total	$	994,700

Schedule of Debt [Table Text Block]

The following table presents debt outstanding as of December 31:


In thousands	2021		2020
NW Natural:
First Mortgage Bonds:
9.050% Series due 2021	$	—	$	10,000
3.176% Series due 2021	—		50,000
3.542% Series due 2023	50,000		50,000
5.620% Series due 2023	40,000		40,000
7.720% Series due 2025	20,000		20,000
6.520% Series due 2025	10,000		10,000
7.050% Series due 2026	20,000		20,000
3.211% Series due 2026	35,000		35,000
7.000% Series due 2027	20,000		20,000
2.822% Series due 2027	25,000		25,000
6.650% Series due 2027	19,700		19,700
6.650% Series due 2028	10,000		10,000
3.141% Series due 2029	50,000		50,000
7.740% Series due 2030	20,000		20,000
7.850% Series due 2030	10,000		10,000
5.820% Series due 2032	30,000		30,000
5.660% Series due 2033	40,000		40,000
5.250% Series due 2035	10,000		10,000
4.000% Series due 2042	50,000		50,000
4.136% Series due 2046	40,000		40,000
3.685% Series due 2047	75,000		75,000
4.110% Series due 2048	50,000		50,000
3.869% Series due 2049	90,000		90,000
3.600% Series due 2050	150,000		150,000
3.078% Series due 2051	130,000		—
Long-term debt, gross	994,700		924,700
Less: current maturities	—		60,000
Total long-term debt	$	994,700	$	864,700

Fair Value Of Long Term Debt Table [Text Block]

The following table provides an estimate of the fair value of long-term debt, including current maturities of long-term debt, using market prices in effect on the valuation date:


	December 31,
In thousands	2021		2020
NW Natural:
Gross long-term debt	$	994,700	$	924,700
Unamortized debt issuance costs	(8,205)		(7,480)
Carrying amount	$	986,495	$	917,220
Estimated fair value(1)	$	1,110,741	$	1,097,348
NW Holdings:
Gross long-term debt	$	1,053,241	$	962,905
Unamortized debt issuance costs	(8,309)		(7,480)
Carrying amount	$	1,044,932	$	955,425
Estimated fair value(1)	$	1,174,500	$	1,136,311
(1) Estimated fair value does not include unamortized debt issuance costs.