Exhibit 99.1 For Immediate Release Nov. 5, 2025 NW Natural Holdings Reports Third Quarter 2025 Results Based on Strong Performance, Expect to be Above Midpoint of 2025 Guidance Range PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: "Driven by strong execution of our 2025 plan, we now expect EPS results to be above the midpoint of our guidance range," said Justin B. Palfreyman, President and CEO of NW Natural Holdings. " ...