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Puget Sound Energy transmission and infrastructure project​

North Kitsap and Bainbridge Island electric system improvements

Fall 2013 project updates
  • Permit application submittal for the Agate Pass tower replacement project took place in October 2013. As part of the permitting process, a public meeting was held on Tuesday, Sept. 24 at Bainbridge Island City Council Chamber. 
  • Agate Pass tower replacement construction is anticipated to begin in summer 2014 or 2015, depending on the permitting timeline.
  • We are currently in the project development and design phase for the Port Madison Tap and Foss Corner-Port Madison line upgrades. The distribution tree wire project will be constructed as early as 2014 or 2015 and the Port Madison Tap line upgrade is currently planned for construction in 2015. Construction of the Foss Corner-Port Madison line upgrade is currently planned for 2016.
Project overview

As part of our commitment to provide our customers with safe and reliable electric service, PSE has plans to replace two existing Agate Pass lattice steel towers with four steel poles, and upgrade two existing transmission lines serving north Kitsap County and Bainbridge Island.

Agate Pass tower replacement project

The existing lattice towers (see map) support the only two transmission lines carrying power from the mainland to Bainbridge Island. The towers were built in the late 1960s and are reaching the end of their lifespan. If they are not replaced in the next few years, the towers - and the transmission lines they carry - will be at an increased risk of failure, which could result in widespread power outages for our customers in north Kitsap County and Bainbridge Island. By replacing the two existing lattice towers with four new steel poles, we can ensure the transmission lines will remain safe and reliable for many years to come. Construction is expected to take place in 2014 or 2015, depending on the permitting schedule.

Port Madison Tap 115 kV line and Foss Corner-Port Madison line upgrades

Both the Port Madison Tap and Foss Corner-Port Madison 115 kV transmission lines (see map) are reaching their capacity limits, which decreases the system’s ability to serve customers with reliable power during times of high energy usage or if there is a planned or unplanned outage on one of the lines.

In an effort to reduce the likelihood of power outages for customers in the north Kitsap, Suquamish and north Bainbridge Island areas and improve the operational flexibility of the system, we plan to upgrade the lines with higher capacity wire and replace some existing wood poles with taller wood poles. With higher capacity wire, any future outage to one line will allow the other line to continue serving customers in the area with uninterrupted service.

As part of the Port Madison Tap 115 kV line project, we also plan to replace approximately 3.5 miles of existing overhead distribution line with specialized tree wire. Tree wire is a specially coated overhead wire, which is strong enough to withstand a tree limb falling into the line, and can significantly reduce the frequency of tree-related power outages. Portions of distribution line that will be upgraded with tree wire are located on the same poles as the Port Madison Tap 115 kV line (see map). We anticipate construction on the distribution line may begin as early as 2014.

The Port Madison Tap 115 kV line is expected to be upgraded in 2015 and construction on the Foss Corner-Port Madison 115 kV project is expected in 2016.

Contact us:

For more information on this project, e-mail or call Barry Lombard, project manager, at 425-456-2230. You may contact us via U.S. mail at:

Attn: Agate Pass Project PSE-09S
Puget Sound Energy
PO Box 97034
Bellevue, WA 98009-9942

Bainbridge map
Download full size map

Project map
(395 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 generating facilities 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 and businesses near the project area when construction will occur. We aim to complete the work with as little disruption as possible.

Download the information

Download these PDF files for more details on the Agate Pass tower replacement and transmission reconductor projects.

Agate Pass Tower Replacement Project - Sept. 24, 2013 public meeting

Agate Pass Tower Replacement Project - Power Point Presentation
Agate Pass Tower Replacement Project - Visual Simulations
Agate Pass Tower Replacement Project - Project Timeline


Project documents

Projects map, revised November 2013
Agate Pass Tower Replacement project update notice, Sept. 2013
Agate Pass Tower Replacement Project notice
Foss Corner Reconductor Project notice