Exhibit 99.1 For Immediate Release May 6, 2024 NW Natural Holdings Reports First Quarter 2024 Results PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: • Reported net income of $63.8 million ($1.69 per share) for the first quarter of 2024, compared to net income of $71.7 million ($2.01 per share) for the same period in 2023 • Added nearly 15,000 gas and water utility connections in the last 12 months for a growth rate ...