Gas Price Information

Rate Changes Take Effect November 1, 2019

Each fall, NW Natural files for rate changes, based primarily on the wholesale cost of natural gas, plus some annual adjustments for ongoing agreements with the commissions. These adjustments vary based on different use patterns by customer class. Variations between Oregon and Washington are caused by differences in rate structures.

Customers can get more information by calling us at 503-226-4211 and asking for the Rates and Regulatory Department.


The new rates for Oregon customers reflect the annual Purchased Gas Adjustment (PGA), which were approved by the Public Utility Commission of Oregon on October 24 and take into account a true-up of the prior year’s natural gas purchases and the cost of natural gas projected for the year ahead.

Rates for Oregon residential customers using an average of 54 therms per month will be about $2.31 or 4.4% more a month.

Rates for small-commercial customers using 235 therms per month will be about $4.60 or 2.3% less a month. The adjustments vary based on different use patterns by customer class.

Update: On Dec. 30, 2019, NW Natural filed for a general rate increase with the OPUC that would result in a net revenue increase of $71.4 million to recover costs associated with investments to strengthen and reinforce the natural gas system, provide necessary system maintenance and operational resiliency, and technology upgrades. If approved as filed, the typical residential customer using 53 therms per month would see an average monthly bill increase of about $6.43. A commercial customer using 242 therms a month would see an average monthly bill increase of about $25.40. The request will not affect customer bills for the 2019-2020 winter season. The filing will be reviewed by the OPUC and other stakeholders in a process that could take up to 10 months. New rates are expected to be effective Nov. 1, 2020.


NW Natural customers in Washington will be paying new rates on November bills that include the combined effects of a rate case and the PGA, both recently approved by the Washington Utilities and Transportation Commission.

Rates will increase $5.1 million to recover operating costs, investments in greater system reliability and resiliency, and historical energy efficiency program costs.

For the average residential customer, this equates to about $3 or 6.2% more per month. The average small business will have about an$11.30 or 5.8% increase per month. It has been more than a decade since NW Natural’s last rate case in Washington.

Additionally, the PGA will result in $2.25 or 4.6% more a month for the average Washington residential customer, and about $9.75 or 4.9% additional for the average small business.

All total, the average residential customer in Washington will pay about $5.25 more per month. Average monthly bill calculations are based on residential usage of 57 therms per month and small business usage of 248 therms per month. The effect of rate changes may vary for individual customers depending on their customer category, usage and other factors.