Northwest Natural Holding Company, through its subsidiary Northwest Natural Gas Company, provides regulated natural gas distribution services to residential, commercial, and industrial customers in the United States. It operates through three segments: NWN Gas Utility, SiEnergy, and NWN Water. The company also operates a mist gas storage facility contracted to utilities, third-party marketers, and electric generators, and offers natural gas asset management, interstate storage, and appliance retail services. In addition, it engages in gas storage, water and wastewater, non-regulated renewable natural gas, and other investment businesses, and provides natural gas services in Oregon and southwest Washington, water and wastewater connections, and operation, maintenance, and management services to water and wastewater system owners. Founded in 1859, the company is headquartered in Portland, Oregon.