Northwest Natural Gas Company, dba NW Natural (NYSE:NWN), will issue an interstate storage credit to its Oregon customers on their June bills for the 14th year in a row. This year’s total credit is for approximately $9.6 million. The average residential customer’s credit will equal about $10, and the average commercial customer’s will be nearly $43. The credit results from efficient pipeline capacity management and effective use of the company’s underground natural gas storage facility in Mist, Oregon, during 2014. The technique used to make the most of these resources is called “optimization.” In the last 14 years, customers have received more than $101 million in bill credits from optimized pipeline and storage capacity.