King County

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Puget Sound Energy electric transmission line project

Lake Hills - Phantom Lake 115kV transmission line

Fall 2009 project updates

PSE is continuing to work through the route selection process

PSE expects to hold a third community meeting in late 2009 or early 2010

Project Overview

PSE is planning to build a new transmission line to connect our existing Phantom Lake and Lake Hills substations. Connecting the two substations will increase electrical system reliability and allow for better use of existing capacity. Currently our Phantom Lake, Lake Hills and College substations are served radially, which means they are each served by one transmission line. If the line serving a substation goes out, the substation and the customers served by it lose power.

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, with the new line, PSE will be able to use each of the substations to its designed capacity. The new transmission line will allow PSE to better use the existing capacity of the substations without additional substation expansion.

Download full-size map

Project map (272 KB PDF)

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 farms to substations in local communities. Transmission normally takes place at voltages of 55 kV and higher.

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. We aim to complete the work with as little disruption as possible.