Glebe-Potomac River

We are proposing a new transmission line to strengthen reliability in this area for local residents and businesses. The proposed line would run for approximately 2 miles, depending on route.

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Benefits

This substation project will:

  • Comply with mandatory North American Electric Reliability Corporation (“NERC”) Standards
  • Support continued economic development and growth in the Alexandria/Arlington area
  • Maintain continued reliable service to local customers
  • Help strengthen the electrical grid

Description

Current reliability studies have determined that by summer 2020, the existing transmission facilities in the City of Alexandria and Arlington County will no longer adequately meet demand and mandatory North American Electric Reliability Corporation (NERC) reliability criteria. In response, a new transmission line is proposed between Dominion Energy's Glebe Substation located at the intersection of S. Glebe Road and S. Eads Street, and Pepco’s Station C Substation at the intersection of Slaters Lane and E. Abingdon Drive.

Dominion Energy has presented and received approval for the need of the proposed project from PJM - the first step required as a member of the PJM regional transmission organization. Concerns include potential violations of mandatory North American Electric Reliability Corporation (NERC) reliability standards and potential overloads in the region given certain electric use and load contingencies.

The New Line Solution, formerly known as Glebe‐Potomac River Substation, requires a new 230kV underground transmission line from Dominion Energy’s existing Glebe Substation in Arlington County to Pepco’s existing Potomac River Substation in the City of Alexandria. Additional infrastructure improvements will be required at Glebe Substation and Potomac River Substation. The Rebuild Solution requires the re‐conductor, rebuild, and ampacity uprate of sections of existing overhead and underground lines in Fairfax County and the City of Alexandria. Additional infrastructure improvements will also be required at multiple Dominion Energy Substations.

Routes and project scope studies take into account input from neighbors, cost, routing constraints and regulatory requirements.

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