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Puget Sound Energy electric transmission line project

Lake Hills - Phantom Lake 115kV transmission line

Winter 2014 project updates
  • A public open house was held at Bellevue City Hall (450 110th Ave NE) on May 21, 2012. The public was encouraged to attend the informational session where members of PSE's project team were present to answer questions specific to the Lake Hills - Phantom Lake project. 
  • Puget Sound Energy has selected the proposed project route corridor and applied for permits. We're currently in the engineering phase.
  • After talking with the City of Bellevue, we will postpone construction of the half-mile line segment along Southeast 16th Street between 148th Avenue Southeast and Phantom Lake substation so we can coordinate with the city on a future road improvement project.
  • We expect to begin construction of the remaining segments of the line along Northeast 8th Street and 148th Avenue Southeast as early as 2015.
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.
Download full-size map

Project map

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.

Committed to keeping you informed

PSE will continue to provide updates to the community. We will notify residents and businesses near the project area when construction will occur. We aim to complete the work with as little disruption as possible.

Download information

Download these PDF files for more detail on PSE's Lake Hills to Phantom Lake electric transmission project.


Proposed route corridor road map, February 2013
Project update notice, February 2013

May 2012 City of Bellevue public meeting
Meeting invite, May 2012
Proposed Lake Hills Substation Landscape Elevations, May 2012
Proposed Lake Hills Substation Landscape Plan, May 2012
Proposed Phantom Lake Substation Landscape Plan, May 2012
Proposed Phantom Lake Substation Landscape Elevations, May 2012

Proposed route corridor road map, December 2011
Proposed route corridor aerial map
Proposed route corridor photo simulations

April 2011 public meeting
Meeting invite, April 2011
Project map, April 2011
Aerial map
Preliminary preferred route aerial map
Reliability graphic
Substation service area map (Updated Sept. 2012)
Examples of typical transmission structures
Lake Hills substation landscape plan
Phantom Lake substation landscape plan

June 2010 presentation to Lake Hills Neighborhood Association
Undergrounding distribution presentation, June 2010

April 2008 public meeting
Meeting invite, April 2008
Fact sheet, April 2008
Project map, April 2008
Criteria flow chart

November 2007 public meeting
Meeting invite, Nov. 2007
Fact sheet, Nov. 2007
Project map, Nov. 2007
Aerial map
Permit flow chart

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