v3.26.1
Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2026
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
The following table presents the absolute notional amounts related to open positions on NW Natural derivative instruments:
June 30,December 31,
In thousands202620252025
Natural gas (in therms):
Financial785,220 807,000 757,895 
Physical959,775 811,360 692,275 
Foreign exchange (in dollars)$9,233 $10,155 $8,596 
Schedule of Income Statement Presentation of Derivative Instruments
The following table reflects the income statement presentation for the unrealized gains and losses from NW Natural's derivative instruments:
Three Months Ended June 30,
20262025
In thousandsNatural gas commodityForeign ExchangeNatural gas commodityForeign Exchange
Benefit (expense) to cost of gas$8,416 $(170)$4,651 $302 
Amounts deferred to regulatory accounts on balance sheet
(8,416)170 (4,651)(302)
Total gain (loss) in pre-tax earnings$— $— $— $— 
Six Months Ended June 30,
20262025
In thousandsNatural gas commodityForeign exchangeNatural gas commodityForeign exchange
Benefit (expense) to cost of gas$(6,613)$(284)$34,348 $278 
Amounts deferred to regulatory accounts on balance sheet
6,613 284 (34,348)(278)
Total gain (loss) in pre-tax earnings$— $— $— $—