Northwest Natural Holding Company operates through three primary business segments: NWN Gas Utility, SiEnergy, and NWN Water. Its core NWN Gas Utility segment delivers natural gas to customers in Oregon and southwest Washington, while its SiEnergy segment provides natural gas utility services in key Texas markets. The NWN Water segment operates water and wastewater utilities across multiple states. Additionally, the company manages the Mist underground gas storage facility and invests in renewable natural gas projects through its NW Natural Renewables subsidiary. Founded in 1859 as the Portland Gas Light Company, it has grown into a diversified multi-state utility provider serving nearly one million customers.
