Northwest Natural Gas Company is engaged in the distribution of natural gas. The Company operates in two business segments: Local Gas Distribution and Gas Storage. 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; and the 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. As of December 31, 2014, the Company had 700,000 customers with around 89% located in Oregon and 11% located in Washington. It provides natural gas service to over 100 cities in around 18 counties.