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Puget Sound Energy natural gas pipeline project

North Seattle town border station

Spring 2012 project completion
  • The construction portion of the project began in October 2011 and was completed in January 2012
  • We completed equipment testing, calibration and tuning and put the gate station in service in April 2012
Project overview

PSE upgraded the natural gas system in Snohomish and North King counties to meet customers' current and future needs. In spring 2012 we installed a new natural gas heater at the North Seattle town border station located east of I-5 and south of the SR 405 junction in unincorporated Lynnwood. The heater was needed to ensure the continuation of uninterrupted service to existing customers and accommodate growing demand for natural gas in the area. We have operated the town border station on this site since 1967, which currently supplies roughly 20 percent of the natural gas in PSE's five-county natural gas service area.

In years prior to the work, icing problems developed on the piping around the natural gas regulators located inside the station due to load growth. As the pressure of natural gas is reduced, it cools. Excessive cooling can lead to operational problems including a build-up of ice on the pipe and other station components. The accumulation of ice can make it difficult to operate and maintain pipes, valves, controls, and instruments.

Download full-sized map

Project map (823 KB PDF)


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What is a town border station?

A town border station is a natural gas facility that transitions the natural gas from an interstate transmission pipeline to the local distribution company. Williams Northwest Pipeline is the interstate transmission company that delivers natural gas to PSE at our North Seattle town border station, where we then reduce the pressure of the natural gas to deliver it to our customers through our distribution system.


How does natural gas get to my home or business?

Natural gas is a fossil fuel composed almost entirely of methane. Interstate pipelines transport natural gas to regional utility natural gas systems, where it is metered and delivered through a network of local mains, service lines and, ultimately, to customer homes and businesses. More than one-third of all Washington state households and businesses use natural gas.

Download the information

Download the PDF files for more detail on PSE's North Seattle natural gas town border station project.

Project Map (823 KB PDF)
Construction notice, Oct. 2009 (25 KB PDF)
FAQ, Oct. 2009 (34 KB PDF)


The photo on the left captures the removal of the existing high pressure plug valve. The photo on the right shows the installation of the new high pressure inlet and outlet piping for the new heater. Click on a photo to see an enlarged version.