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Puget Sound Energy substation project


Cascade substation project

Winter 2013 project complete
  • Construction on the first phase of the Cascade substation upgrade was completed on schedule in December 2012.
  • The second phase of construction began in early April 2013 and was completed in late 2013.
Project overview

Puget Sound Energy upgraded the electric system to better serve customers in Cle Elum, Easton, Ellensburg, Kittitas, Ronald, Roslyn, Snoqualmie Pass, south Cle Elum and Thorp. PSE expanded the capacity of the Cascade substation, located at 1980 SR 903 in Cle Elum, by installing a new 230-34 kilovolt transformer to serve load in the area. Previously, the substation was at its operating capacity. Additionally, we added substation equipment (circuit breakers) that provide back-up to existing power lines and reduce the number of customers affected by planned and unplanned outages. The footprint of the substation significantly increased in size within PSE’s existing property (see before and after map).

Download full-size map

Project map

Cascade substation aerial view

Construction progress of the
Cascade Substation from an
aerial view

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.

Download information

Download these PDF files for more detail on PSE's Cascade substation project.
Project map
Before and after footprint map