Northwest Natural Gas Company is engaged in the distribution of natural gas. The Company's segments include Local Gas Distribution, Gas Storage and other. The Company maintains operations in Oregon, Washington and California and conducts businesses through NW Natural and its subsidiaries. The local gas distribution business, referred to as the utility segment, serves residential, commercial, and industrial customers in Oregon and southwest Washington. The Company gas storage business, referred to as the gas storage segment, provides storage services for utilities, gas marketers, electric generators and industrial users from storage facilities located in Oregon and California. The Company's other segment is referred to as non-utility and consists of non-utility investments and other business activities. The other segment consists of an equity method investment in Trail West Holdings, LLC (TWH) and other pipeline assets in NNG Financial Corporation.