Renewable Natural Gas (RNG)

NW Natural Adds Renewable Natural Gas through Partnership with City of Portland

In what the city refers to as Portland’s largest climate action project, greenhouse gas emissions produced by wastewater will be converted into Renewable Natural Gas (RNG) at the City’s waste water treatment plant. That RNG will then be put on our pipeline and into vehicles.

The RNG made from Portland’s plant will replace 1.34 million gallons of diesel fuel with enough natural gas to run 154 garbage trucks for an entire year.

What is RNG?

Renewable Natural Gas (RNG) is made from biogas released by organic materials as they decompose. Food waste, landfills, manure from dairy farms and sewage treatment plants all produce biogas that can be captured and upgraded to create RNG to fuel vehicles or be placed in the pipeline. RNG is interchangeable with conventional pipeline natural gas and can also be stored for long periods of time.

How does it help the environment?

Using RNG to replace diesel can reduce air pollution from trucks by 90 percent and greenhouse gasses by 80 percent – making it the lowest carbon fuel option for heavy-duty vehicles.

How will the project work?

This project is a partnership with the City of Portland’s Bureau of Environmental Services. NW Natural will build and maintain the fueling station and pipeline infrastructure needed to serve the facility.

“We’re proud to partner with Portland to close the loop on waste,” said David H. Anderson, NW Natural president and CEO. “We look forward to this being the first of many other renewable natural gas projects that can help improve air quality and move us toward a low-carbon future.”

  • Read more—See more details about the Wastewater Treatment project.
  • The current RFP for RNG offtake opportunities can be downloaded here. For any questions related to this RFP, please contact
  • A forthcoming RFP for RNG project development opportunities will be available in fall 2020. To be placed on the distribution list for that RFP, please also contact