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Puget Sound Energy natural gas line project

Tolt natural gas line project

Fall 2013 project updates​
  • PSE is currently in development for phases 1 and 2.
  • We hosted public open houses on July 18 and 23 to provide background on the project and discuss next steps. We also presented project information at the July 23 Upper Bear Creek Community Council meeting.
  • Permit application submittal for phases 1 and 2 is expected to take place in early 2014. Phase 1 is expected to be constructed in 2015, depending upon permits. Phase 2 is expected to be constructed around 2022-2025 based on future growth projections. Click here for the anticipated project timeline and project timeline road map.​​​
  • We have purchased a site for the new gate station to be built during Phase 2 of the project. The gate station site is located along 216th Ave NE, north of NE 144th Pl. ​​​
Project overview

As the demand for natural gas grows, Puget Sound Energy's existing 8-inch high pressure natural gas line serving northeast King County is nearing its capacity limits during cold winter days, when people use more energy to stay warm. The system's capacity constraints impact our ability to supply natural gas at an adequate pressure to reliably serve more than 27,000 residential, commercial and industrial customers in the Woodinville, Bothell, Kenmore, Kirkland and unincorporated King County areas. In order to maintain the current reliability of the natural gas system in the area and ensure we can continue to provide our customers with dependable service in the future, PSE plans to upgrade the natural gas system in northeast King County. View the voiceover presentation for more information.

Our plans entail installing approximately four miles of new 16-inch high pressure natural gas pipeline and construct a new gate station in the area. (A gate station is a facility where natural gas is metered, reduced in pressure, and injected with a strong odorant called mercaptan, which gives the gas its familiar rotten-egg smell.) When complete, this new infrastructure will add necessary capacity to the existing system and reinforce the current natural gas pipelines in the area, meaning our customers can continue to depend on reliable natural gas service well into the future.

Below are details on the multi-year construction effort and estimated project timelines:

  • Phase 1: Construct 2.8 miles of 16-inch natural gas pipeline along the existing Seattle Public Utilities Tolt utility corridor between Mink Road Northeast and 155th Avenue Northeast. This project is expected to be constructed in 2015, depending upon permits (see Phase 1 aerial map).
  • Phase 2: Construct 1.2 miles of 16-inch natural gas pipeline along the existing Tolt utility corridor between 216th Avenue Northeast and Mink Road Northeast, where it will connect to the segment of pipeline constructed in Phase 1. Plans also entail constructing a new gate station near the intersection of 216th Avenue Northeast and the Tolt corridor (actual location yet to be determined). We expect to construct this phase in 2022 based on current growth forecasts (see Phase 2 aerial map).

As growth continues in the area, there is a potential for a third phase in PSE's long-term plan. The third phase would run approximately 1.9 miles along the Tolt utility corridor between 155th Avenue Northeast and 132nd Avenue Northeast (see project timeline road map and Phase 3 aerial map). We do not currently have an expected timeline for this phase of work, but will be monitoring population growth, future planned residential and commercial development and natural gas usage in the area over the next several decades to help us determine when the third phase would be necessary for our customers. Current high-level planning estimates suggest this work would occur around 2033.

Tolt natural gas line map thumbnail
Download full-sized map

Project Map
(379 KB PDF)

It is our goal to minimize construction impacts in the Tolt corridor and for the people who utilize it as much as possible. We plan to use installation techniques that will allow us to decrease disruption of nearby wetlands and critical areas, as well as the corridor itself. Additionally, because the Tolt corridor is popular with local walkers, runners, cyclists and equestrians, we hope to keep the majority of the corridor open during construction so the corridor can still be used for recreation purposes. Lastly, after construction is complete, PSE will restore the construction zone back to its original condition.


At PSE, we know our customers, employees and the communities we serve expect to live and work around a safe and reliable natural gas system. Safety is our top priority when it comes to designing, constructing, operating and maintaining the natural gas system serving more than 750,000 PSE customers. When improving and operating our system, we follow or exceed strict federal and state safety requirements related to pipeline safety. Click here for more information on natural gas safety.

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 natural gas systems, where it is metered and delivered through a network of local mains, service lines and, ultimately, to customer homes and businesses. View How Natural Gas Gets to You.

Committed to keeping you informed

PSE will continue to provide updates to the community. We will notify residents who live near the project area when construction will occur. It is our aim to complete this work with as little disruption as possible.

Contact us

We welcome your questions and comments! Please contact:

Patima Dejarath
Project Manager


Jason Van Nort
Local Community Engagement Manager

Download the information

Download the PDF files for more detail on PSE's Tolt natural gas line project.

Fact sheet (updated November 2013) (187 KB PDF)

Project timeline map (all phases) (updated November 2013) (379 KB PDF)

Natural Gas 101

Project Need

Project Background

Natural Gas Safety

July 23 Upper Bear Creek Community Council presentation
    July 18 and 23 open houses