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Puget Sound Energy substation project
Lake Holm Substation and Berrydale-Lake Holm Transmission Line
Fall 2013 Project Updates
- We held a public meeting on June 27, 2012 to introduce the project and gather feedback from community members on the proposed upgrades.
- Based on feedback from the public meeting, PSE has selected its preliminary preferred route corridor for the new transmission line along 156th Ave SE; Kent Kangley Rd; and Kent-Black Diamond Rd (see project map). The new line would “overbuild” the existing distribution lines along the route. Overbuilding means the new transmission line would be co-located on the same poles as the existing distribution line. Many of the existing wood poles would be replaced with taller wood poles that can accommodate both the existing distribution line and the new transmission line (see example before and after photos).
- We would like your feedback on the preliminary preferred route. Please feel free to email the project team at email@example.com or call Project Manager Janet Olsen at 425-462-3912.
- We have purchased a substation site for the new substation at the corner of Southeast Lake Holm Rd and 192 Avenue Southeast.
- Construction of the substation and transmission line is planned for 2017. We will continue to engage and inform customers as engineering, critical area studies and permit efforts move forward.
To ensure that the energy supply remains dependable to the communities of Covington, Black Diamond and Kent, PSE is planning a series of electric system upgrades that will improve service reliability for many customers in a 100-square-mile surrounding area. These will be multi-phase and multi-year projects, and will include the construction of a new substation in Lake Holm a new 115 kV transmission line and associated distribution lines. We will also upgrade four existing substations in the area to accommodate the new transmission line.
The multi-year construction effort includes the following projects and expected timelines:
- Inform the public of the planned projects, gather community feedback and answer questions.
- Finalize the route for the first phase of the transmission line.
- Begin work to engineer and permit the projects.
- New Lake Holm substation: Construct a new distribution substation at the intersections of Southeast Lake Holm Rd and 192 Avenue Southeast.
Currently, customer energy usage in the area is straining the system. We need to increase system capacity to ensure we can continue to provide reliable power to customers well into the future.
- New Berrydale-Lake Holm 115 kV transmission line (the first of a two-phase transmission line project): Construct approximately six miles of new 115 kV transmission line between the pre-existing Berrydale substation and the new Lake Holm substation.
The new line will provide a source of power for the new Lake Holm substation, and will be the first portion of a new transmission line to increase overall electric reliability for customers in the area.
PSE has identified our preliminary preferred route for the new transmission line along 156th Ave SE; Kent Kangley Rd; and Kent-Black Diamond Rd (see project map). To minimize the impact to private property and residents as much as possible, we plan to “overbuild” the existing overhead distribution lines along the roadway. Overbuilding means the new transmission line would be co-located on the same poles as the existing distribution line. Many of the existing wood poles would be replaced with taller wood poles that can accommodate both the existing distribution line and the new transmission line (see before and after photos).
- Distribution system improvements: Construct new and reconfigure existing distribution circuits in the Lake Holm area to decrease the likelihood of power outages for customers.
Currently, three distribution lines bring power long distances to the Lake Holm area. If an outage occurs on one of the existing lines, there is not enough redundancy or capacity in the system to continue to serve customers, and a power outage is likely. These distribution lines are notorious for lengthy tree-related power outages.
The distribution improvements will shorten the length of the lines serving the area and add more lines, allowing us to move power around more easily and reduce the possibility of line overload. The end result will be a decrease in the number and length of power outages our customers experience.
- Substation upgrade: Upgrade the existing Berrydale substation to accommodate the new Berrydale-Lake Holm transmission line.
- New Lake Holm-Krain Corner 115 kV transmission line (the second of a two-phase transmission line project): Construct approximately 10 miles of new transmission line between the Lake Holm substation and the pre-existing Krain Corner substation, with plans to loop the line through the Black Diamond substation and Cumberland substation, strengthening reliability to the whole area.
Currently, there is a limited number of transmission lines in the area, which means there is not much redundancy in the system. If an outage occurs on one of the existing transmission lines, we are unable to continue serving customers on another transmission line – resulting in a power outage to customers. The new transmission line will provide another pathway to move power around the area, increasing our flexibility to continue serving customers even if one line is without power.
The route for this transmission line has not been identified yet, but will likely follow pre-existing overhead lines in the interest of minimizing the impact to private property and residents.
- Substation upgrades: Upgrade the existing Black Diamond, Cumberland and Krain Corner substations to accommodate the new Lake Holm-Krain Corner transmission line.
Download these PDF files for more detail on PSE's Lake Holm substation and electric transmission line project.
October 2012 project update notice
June 27, 2012 public meeting
Project study area
Map of local distribution circuits
Typical route selection criteria
Example photos of transmission overbuild on existing distribution line
Special land use designations in the project area
Public meeting invitation
Public meeting print ad