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Puget Sound Energy substation and transmission line project

Carpenter substation and transmission line project

Fall 2014 project updates

  • Construction on the transmission line started in June 2010 and was completed in November 2010.
  • Construction on the substation is expected to begin in spring 2018.

Project overview

To increase electric reliability for Thurston County-area customers and meet increasing demand for power in northeastern Thurston County – including Lacey, Olympia and their urban growth areas – PSE plans to build a new substation in Lacey. When complete, the new substation will include one 25 mega volt ampere (MVA) transformer and have the space to add a second 25 MVA transformer, allowing PSE to double the capacity in the future without changing the substation footprint.

In 2010, we built two miles of new 115 kilovolt (kV) transmission line on Draham Rd NE and 15th Ave NE in Lacey. We replaceed the existing distribution poles along the route with taller poles to accommodate both the existing distribution line and new transmission line.


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What is a transmission line?

Transmission lines are key elements in the electrical distribution system. These 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 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.

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.