| Schedule of Carrying Values and Estimated Fair Values of Debt Instruments |
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: | | | | | | | | | | | | | | | | | | | | | | | June 30, | | December 31, | | In thousands | | 2024 | | 2023 | | 2023 | | NW Natural: | | | | | | | | Gross long-term debt | | $ | 1,374,700 | | | $ | 1,334,700 | | | $ | 1,374,700 | | | Unamortized debt issuance costs | | (9,634) | | | (10,141) | | | (9,968) | | | Carrying amount | | 1,365,066 | | | 1,324,559 | | | 1,364,732 | | Estimated fair value(1) | | 1,182,455 | | | 1,176,519 | | | 1,236,559 | | | | | | | | | | NW Holdings: | | | | | | | | Gross long-term debt | | $ | 1,585,986 | | | $ | 1,545,553 | | | $ | 1,586,344 | | | Unamortized debt issuance costs | | (10,369) | | | (10,261) | | | (10,044) | | | Carrying amount | | 1,575,617 | | | 1,535,292 | | | 1,576,300 | | Estimated fair value(1) | | 1,393,946 | | | 1,385,612 | | | 1,447,941 | |
(1) Estimated fair value does not include unamortized debt issuance costs.
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