How a looped transmission system will improve reliability on Bainbridge Island

In late January, PSE’s Electric First Response Crew responded to a report of a tree leaning on the Winslow Tap transmission line. To safely remove the tree, crews needed to de-energize the line, which took out power for over 4,000 Bainbridge Island customers for about an hour. We apologize for this inconvenience. The Winslow Tap is the only transmission line that serves the Winslow Substation, which means if the Winslow Tap goes out, then the substation and all customers served by the substation lose power.

Crews restored power rather quickly; however, this outrage could have been prevented or reduced to about 10 seconds if the Murden Cove-Winslow 115kV transmission line were in place. This new transmission line will connect the Winslow and Murden Cove substations, creating a transmission loop. Each substation will be connected by two transmission lines. If one of the transmission lines goes out, the other transmission line can still feed the substation and provide power to customers while crews make repairs.

We know outages are frustrating and disruptive. By investing in transmission infrastructure like the Murden Cove-Winslow 115kV transmission line, PSE is making the Island’s grid more resilient and reducing the impact of any single outage. Currently, we continue field work, engineering, real estate planning and permitting on the Murden Cove-Winslow 115kV Transmission Line project. We plan to build the project in 2027 – 2028. Learn more about this project at