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Puget Sound Energy transmission line project

Lake Hills-Phantom Lake 115 kV transmission line

Fall 2014 project updates

  • City of Bellevue will host a public hearing to review PSE’s permit application on Thursday, Nov. 20 at 7 p.m. at City Hall.
  • Puget Sound Energy has selected the proposed project route. We're currently in the permitting and engineering phase.
  • We expect to begin construction of the line along NE 8th St and 148th Ave SE as early as 2015, depending on permitting.
  • After talking with the City of Bellevue, we have decided to postpone construction of the half-mile line segment along Southeast 16th Street between 148th Avenue Southeast and Phantom Lake substation so we can minimize disruption by timing with a future road improvement project.

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Project map

Project overview

Currently the electric system serving the Lake Hills neighborhood of Bellevue has limited reliability, which increases the risk of outages to customers. PSE’s Lake Hills and Phantom Lake substations are served radially, which means they are each served by one transmission line. If the radial line serving a substation goes out, the substation and the customers served by it lose power. In addition, because the substations are served radially, we are unable to use each of the substations’ full design capacity.

To help solve these problems, PSE plans to build a new transmission line between the Lake Hills and Phantom Lake substations. The new transmission line will create a "loop", which means each substation will be fed by two transmission lines. If one line goes out, the other line will still feed the substation and customers. In addition, the new line will enable PSE to make future use of each substation's full design capacity. This project will increase overall system reliability and allow for better use of existing facilities for customers in the Lake Hills neighborhood of Bellevue.

PSE has selected our proposed route corridor along Northeast 8th Street, 148th Avenue Southeast, and Southeast 16th Street (see project map).

The City of Bellevue is planning a future public improvement project along Southeast 16th Street. PSE plans to postpone construction of the segment of line along Southeast 16th Street so we can collaborate with the city on design and construction for their project and ours. We believe this plan allows us to minimize construction impacts to neighbors along Southeast 16th Street, as they will be limited to one construction timeframe rather than two. The timeline for the city’s project is to be determined, but not expected to occur until around 2020.

What is a transmission line?

Transmission lines are key elements in the electrical distribution system. The lines safely transport high voltage electricity from power generation sources like dams and wind generating facilities to substations in local communities. Transmission normally takes place at voltages of 55 kV and higher.

What is a substation?

Substations are critical links in the electricity distribution system, containing utility circuit protection, voltage regulation, and equipment that steps down higher voltage to lower voltage. Before reaching homes and businesses, power is routed through our transmission system to a substation where it is changed to a lower voltage that can be utilized by customers.