Northwest Natural Gas Company (NYSE:NWN), dba NW Natural, announced today that it will issue its fourth quarter and full-year earnings release on Friday, Feb. 25, 2011, for the three- and 12-month periods ending Dec. 31, 2010. NW Natural will conduct a conference call and webcast starting at 8 a.m. Pacific Time (11 a.m. Eastern Time) on Feb. 25th, to review the company's financial and operating results. To hear the conference call live, please dial 1-877-317-6789 within the United States and 1-866-605-3852 from Canada. International callers can dial 1-412-317-6789. To access the conference replay, please call 1-877-344-7529 and enter the conference identification pass code (447613). To hear the replay from international locations, please dial 1-412-317-0088. To hear the conference by webcast, log on to NW Natural's corporate website at www.nwnatural.com or through www.InvestorCalendar.com. About NW Natural NW Natural (NYSE:NWN) is headquartered in Portland, Ore., and provides safe, reliable, cost-effective natural gas service to about 667,000 residential, commercial, and industrial customers through 15,000 miles of mains and service lines in western Oregon and southwestern Washington. It is the largest independent natural gas utility in the Pacific Northwest. The company has approximately $2.5 billion in total assets. Since 1989, the company has operated its 16 Bcf Mist underground storage field in Oregon to serve its utility customers and the regional interstate storage market. NW Natural and its subsidiaries currently own and operate underground gas storage facilities with designed storage capacity of approximately 31 Bcf in Oregon and California. Additional information is available at www.nwnatural.com.