Exhibit 99.1 For Immediate Release Feb. 23, 2024 NW Natural Holdings Reports Fourth Quarter and Full Year 2023 Results Initiated 2024 earnings guidance and reaffirmed long-term EPS growth rate target of 4-6% PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: • Reported net income of $93.9 million (or $2.59 per share) for 2023, compared to net income of $86.3 million (or $2.54 per share) for 2022 • Invested $327.3 millio ...