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Puget Sound Energy electric transmission line project

Cottage Brook - Moorlands 115 kV transmission line

Summer 2013 project updates
  • Construction is taking place in two phases. Phase 1 began in May 2012 and was completed in early November 2012
  • Tree trimming in preparation for Phase 2 construction began in May 2013 and construction along the route began in June. We expect to complete construction by September 2013.  
  • We recently provided an incorrect phone number in the construction notice sent to customers in the project area. If you have questions about the project, please contact Project Manager, Jim Kearnes, at 425-462-3927. We apologize for any inconvenience this may have caused.
Project overview

Puget Sound Energy’s existing 50-year-old 115 kilovolt transmission line between the Cottage Brook substation, 14401 188th Ave. NE in Woodinville, and the Moorlands substation, 8010 NE 185th St. in Kenmore, needs to be replaced. In addition to being old, the existing line is approaching capacity, putting it at risk of overloading in certain conditions. If the line overloads, more than 56,000 customers served by 12 local substations in Woodinville, north Kirkland, Bothell, Kenmore and unincorporated King County are at risk of an outage.


To solve these problems, increase the reliability of the electric system, and help meet customers’ current and future demand for electricity in the area, PSE plans to rebuild the existing 7.6 mile 115 kV transmission line by installing higher-capacity wire, replace many of the existing wood poles with new single wood poles, and add a new fiber-optic line. The fiber-optic line helps PSE monitor and coordinate our electric transmission system remotely through instantaneous communication and provides the ability to flip switches from a remote control room. Currently, PSE manages the existing transmission line through static data points, which require manual manipulation of switches to operate the system—a utility worker has to physically go out to the line to flip the switches.

Download full-size map

Project map

What is a transm​ission 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 fiber-optic line?

A fiber-optic line or optical fiber is a glass fiber that is designed to direct light along its length and is used for communication purposes within the electrical transmission system. The fiber-optic lines used in our electric system are small, half-inch in diameter lines. Fiber-optic is light, less expensive, and able to carry much more information at a quicker pace making your lights more reliable.

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.


Contact us

For more information about this project, please email james.kearnes@pse.com or call our project manager, Jim Kearnes, at 425-462-3927.

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 Cottage Brook - Moorlands electric transmission project.

Construction notice, corrected April 2013
Project map, revised November 2012
Construction notice, May 2012
Project notice, April 2011
Fact sheet, May 2011
Project map