Occoquan Substation

New Proposed Transmission Project Changes
to Improvements at Existing Substations

In 2014, our team began work to address a forecasted reliability concern in the Alexandria-Arlington-Fairfax area, and proposed the new Glebe-Potomac River line project. Updated data on the need for the original project has changed and no longer requires a new line, but requires work on two existing substations in Alexandria and Fairfax to resolve our current energy challenge.

In July 2018, Dominion Energy received an updated base case study from PJM, a regional transmission organization, on load projections through 2023. This updated study revealed several changes to the electrical planning horizon – removing the need for certain work.

In addition to changing the need and scope of the solution, cost was also significantly impacted. Specifically, the estimated cost of the Rebuild Solution decreased from approximately $290 million to approximately $170 million. Alternately, the total estimated cost for the New Line Solution is approximately $340 million.

Following these changes, the New Line is no longer a justifiable solution for the current capacity need.

The current solution calls for Dominion Energy to rebuild its existing Glebe Substation in Arlington County and to expand its Occoquan Substation in Fairfax County.

Access historical information on original Glebe-Potomac River project.