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Puget Sound Energy substation project

March Point substation upgrades

Spring 2009 project completion
  • PSE completed the March Point substation upgrades in April 2009
Project overview

To increase capacity and improve reliability of our electric system in Anacortes and surrounding areas of Skagit County, Puget Sound Energy in 2004 began a $10 million project to upgrade our March Point transmission and switching substation, located at 12840 Thompson Road in Anacortes. PSE completed the project in April 2009, which involved:

Download full-size map

Project map (160 KB PDF)

  • Converting the transformer and associated transmission from 55 kilovolts (kV) to 115 kV to increase capacity, and reduce equipment failures and system losses.
  • Installing a new 115 kV auxiliary bus to enable PSE to work on a line or transformer without taking the line or transformer out of service.
  • Replacing an aging transformer to increase capacity and improve reliability.
  • Re-routing a transmission line feeding the Whidbey Island substation to a new location in the substation to increase the reliability to Whidbey Island.
  • Replacing the distribution substation inside March Point substation to increase capacity, minimize equipment failures, and reduce maintenance costs.
  • Replacing system protections, controls and communications equipment to enable PSE to maintain, repair and replace parts of the substation without taking it out of service.


The electric grid works as one unit so the improvements to a substation or transmission line can greatly improve the operation of the entire electric system. Recent upgrades to Sedro-Woolley substation have contributed to the increased capacity and improved reliability at the upgraded March Point substation and the Anacortes area. Visit the Sedro-Woolley substation page to learn more about the substation upgrades.

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.

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.

Download the information

Download these PDF files for more detail on PSE's March Point substation project.
Project map (160 KB PDF)