Northwest Natural Holding Company is a holding company. It operates through its subsidiaries as a provider of natural gas services. It provides its services to residential, commercial and industrial customers in Oregon and Southwest Washington. Its local gas distribution involves the distribution and sale of natural gas to customers in Oregon and Southwest Washington, and includes the utility portion of its underground natural gas storage facility in Mist, Oregon, and the north Mist gas storage expansion in Oregon. Its gas storage segment represents natural gas storage services provided to intrastate and interstate customers from the non-utility portion of the Mist underground storage facility, the Gill Ranch storage facility, and asset management services. Its other segment consists of an investment in a natural gas pipeline project, its natural gas retail appliance store, and other non-utility business development and other activities.