In Your Community » King » Construction Projects »

PSE Transmission project iconPSE Transmission project icon

Puget Sound Energy substation project

Overlake Substation Upgrade

Fall 2014 project updates

  • Construction began the week of Sept. 1, and is anticipated to be complete by mid-December.
  • Work will occur on weekdays between 7 a.m. and 5 p.m. Some night work may be required to transport existing equipment from the substation and haul in the new transformer.
  • No power interruptions are planned as part of this project.

Project overview

The power system that serves Medina is getting an upgrade! PSE is replacing aging equipment at our Overlake substation at 990 80th Avenue NE in Medina.

We regularly upgrade our system to help ensure your power remains safe and reliable. This summer, we’ll replace the Overlake substation’s transformer (the equipment that steps down power from transmission line voltage to distribution voltage to serve neighborhood homes) and replace other substation equipment.

One of most important parts of the upgrade will be the addition of a SCADA (Supervisory Control and Data Acquisition) system at the station that will enable us to monitor and control the station remotely, allowing us to more quickly respond to changing system demands and abnormal system conditions.

Construction notes

To make these upgrades, we will re-grade the entrance to the station’s gravel driveway so we can move large equipment in and out. Flatbed trailers will transport substation equipment, as well as the heavy equipment needed to move it. Inside the station we will remove and replace existing concrete pads. From time to time, some of our work will need to occur outside the station - for example when we disconnect and then reconnect the station to the area power grid.

All of the new equipment will remain within the existing station footprint, and the area landscaping will remain unchanged. When we're done, the station will look about the same as it does today – just with some shiny new equipment.

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.