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Dominion Energy to begin prep work on undergrounding Tysons power line

Tysons to Spring Hill transmission line construction phases (via Dominion Energy)

(Updated at 12:15 a.m. on 4/27/2023) Preliminary construction activities will kick into gear this weekend on a long-gestating project to move part of an electric transmission line underground in the Spring Hill area of Tysons.

Starting this Friday (April 28) evening, Dominion Energy will close the Vesper Trail from Route 7 (Leesburg Pike) to Vesper Street so its crews can install a manhole needed for the project, spokesperson Peggy Fox said. The trail closure will last until Tuesday (May 2).

“This closure is necessary to keep community members safe while we install a manhole,” Fox told FFXnow.

Replacing an existing above-ground line, the new 230-kilovolt transmission line will span approximately half a mile from Dominion’s Tyco Road substation to the vicinity of a planned Spring Hill substation just southwest of Leesburg Pike and Spring Hill Road.

An underground line will be safer and less visually obtrusive, while helping Tysons meet the demand for electricity as the area continues to develop, Dominion has said. Removal of the existing overhead line will also “facilitate” construction on The View, a mixed-use development planned next to the Spring Hill Metro station, according to documents filed with the State Corporation Commission.

The project was endorsed by the Fairfax County Board of Supervisors in March 2020 and approved by the SCC on June 24, 2021.

Dominion notified residents in the area on April 14 that construction on the power line would begin this month, noting that the county has waived noise restrictions for the project until Oct. 31 since some work will occur at night.

“To limit traffic impacts on major roadways, particularly Leesburg Pike, construction will be performed at night,” the utility company said. “This allows our crews to obtain necessary lane closures to complete the work safely and efficiently.”

Split into five phases, the project includes the installation of two manholes, which will occur throughout the day and night so they can be completed “as expeditiously as possible.”

“There will be more impacts to the trail in fall 2023 when we begin installing the underground line in this area, and outreach will take place prior,” Fox said by email. “No impacts to electric service are anticipated as a result of this work.”

Including the addition of a transition pole at the end of the new line and removal of the old overhead line, the project is expected to finish in late 2024. At that point, Dominion says it will begin construction on the Spring Hill substation, which will occupy a 1-acre site near Raglan Road Park.

The new substation will support customers south of Route 7 (Leesburg Pike) and outside of I-495, according to Dominion.

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