Seattle City Light is in the design stage for an electrical reliability upgrade of the East Pine Substation, including increasing equipment capacity by building out two walls and assessing the seismic integrity of the facility.

The East Pine Substation was constructed in 1966-67 at 1501 23rd Ave., and provides power to Capitol Hill and First Hill, which includes several hospitals in the area.

Expanding the north and west walls will allow for future equipment upgrades and build-outs, according to City Light, however, the walls surrounding the substation will first go through a landmark nomination process.

“City Light will be following the City of Seattle's historic preservation regulations and guidelines,” according to a news release. “If the substation is designated a Landmark, the Secretary of the Interior’s Standards for the Treatment of Historic Properties will be applied to proposed changes to the substation and walls.”

Expanding the walls and substation footprint can only be done on the north and west side of the facility, according to City Light, due to the required space. The walls are for security, and high voltage circuit breakers would be added in the expanded space over the next four to five years.

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