Northwest Natural Holding Company is a holding company. The Company operates through its subsidiaries as a provider of natural gas services. Its subsidiary Northwest Natural Gas Company (NW Natural) distributes natural gas to residential, commercial, and industrial customers in Oregon and southwest Washington. The Company operates through the Natural Gas Distribution (NGD) segment. The NGD segment provides natural gas service through over 786,000 meters in Oregon and southwest Washington. The NGD segment serves residential, commercial and industrial customers. Its other business activities include certain gas storage activities, water businesses, and non-regulated renewable natural gas activities. it has a diverse portfolio of short, medium and long-term firm gas supply contracts and a variety of contract types, including firm and interruptible supplies, as well as supplemental supplies from gas storage facilities. Its storage facility is located near Chehalis, Washington.