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Puget Sound Energy substation and transmission line project
East Port Orchard to Manchester transmission line and substation project
Fall 2012 project completion
To increase system reliability and meet growing customer demand for power in the Port Orchard area, PSE constructed a new 115 kilovolt transmission line and upgraded three substations.
The new 115 kV transmission line connects the East Port Orchard and Manchester substations, increasing electrical system reliability and allowing for better use of existing capacity. Previously, the Manchester substation was served radially, which means it was served by one transmission line. The addition of the new transmission line creates a "loop", which means the substation is fed by two transmission lines. Now, if one line goes out, the other line will continue to provide power to the substation and customers in the area. In addition to the new transmission line, we modified and upgraded three substations – the East Port Orchard, Long Lake, and Manchester substations.
The multi-year construction effort included the following projects and estimated timelines:
Upgraded Manchester substation (just west of Woods Road East, north of East Collins Road): PSE updated the existing substation to accommodate the new line. We completed construction on the Manchester substation in June 2010.
Upgraded East Port Orchard substation (2015 Mitchell Road): PSE expanded the substation's existing fence line to accommodate a re-design of the electrical equipment. Construction on the East Port Orchard substation was completed in October 2011.
New East Port Orchard to Manchester 115 kV transmission line: PSE built a new 115 kV transmission line connecting our East Port Orchard and Manchester substations. (See map.)
Upgrade Long Lake substation (4800 SE Sedgwick Road): PSE added a breaker and re-designed the substation to accommodate the new line. We also rerouted a small segment of existing transmission line feeding into the substation. Construction started in the spring of 2012 and was completed in Otober 2012.
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.
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.
Download the information
Download these PDF files for more detail on PSE's East Port Orchard to Manchester transmission line and substation project.
Construction notice, January 2012
Construction notice, January 2011