Dominion Energy
Haymarket Gainesville Wellington john marshall hwy john marshall hwy john marshall hwy james madison hwy james madison hwy james madison hwy prince william pkwy prince william pkwy prince william pkwy 66 66 29 29 university blvd university blvd university blvd lee hwy lee hwy lee hwy heathcote blvd heathcote blvd heathcote blvd somerset crossing dr somerset crossing dr somerset crossing dr heathcote blvd heathcote blvd heathcote blvd jefferson st jefferson st jefferson st catharpin rd catharpin rd catharpin rd wellington rd wellington rd wellington rd wellington rd wellington rd wellington rd Haymarket Elementary School Buckland Mills Elementary School Conway Robinson State Forest Brawner Farm Interpretive Center Piedmont Mews Haymarket Village Center Somerset Carver Rd Community Parks at Piedmont South Crossroads Village Heritage Hunt Manassas National Battlefield Park Chinn Ridge Robert Trent Jones Golf Club Robert Trent Jones Golf Club Stonewall Golf Club Heritage Hunt Country Club Piedmont Club Haymarket Dominion Valley Country Club Haymarket Children's Academy George G TylerElementary Bull Run Middle School Pace West School Gainesville Middle School St Paul's Episcopal Cemetery Gainesville United MethodistChurch Cememtery Stonewall Memory Gardens Groveton Confederate Cemetery St Paul's Episcopal Church Haymarket Baptist Church Potomac Ministry Center Buckland Pentecostal Church Mount Pleasant Baptist Church Church of the Word Construction Update Oct-Nov 2019 – Crews will be completing underground work in the general vicinity of Haymarket Substation. Specifically, crews will begin to dig the trench across John Marshall Highway outside Haymarket Substation for the underground cables. Work hours will generally be from 9 a.m. to 3 p.m. Mondays-Thursdays and 9 a.m. to 2 p.m. on Fridays. Traffic controls will reduce travel to one lane during working hours, but they will reopen to travel in both direction after work is complete each day. simulation 4 overhead simulation 3 hdd simulation 2 Open Trench simulation 1 Tap Point haymarketsubstation heathcotetransitionstation
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project overview

The Haymarket 230 kV Electric Transmission Project was approved by the Virginia State Corporation Commission in July 2018. The final route, known as the I-66 Hybrid Route, consists of a partial overhead and underground build that allows us to accommodate the needs of the community and meet growing energy demands in Prince William County and the town of Haymarket.

Related Documents

  • Open House Information Open House Information
  • Danger Tree Diagram Danger Tree Diagram
  • Access Maps Access Maps
  • Typical Structure Typical Structure
  • Simulations Simulations
  • Right of Way Brochure Right of Way Brochure
  • Cultural & Historical SitesConstruction Brochure(Google Earth Required.)

Existing dominion line #124

Existing Line


Dominion Energy has an existing right of way corridor containing a 115 kilovolt (kV) transmission line that runs from our Gainesville Substation north to our Loudoun Substation. This line will be converted to operate at 230 kV and will not require construction work in this portion of the right of way.

Construction Methods



During the pre-construction phase, crews survey and clear the right-of-way, build access roads, and install erosion control devices.



Overhead line construction on new right of way requires crews to clear trees and install foundations so cranes can be used to erect new structures.

Open Trench

Open Trench

Open Trenching involves excavating along a pre-determined path so transmission cable can be safely installed underground.


Directional Drilling

Horizontal Direction Drilling allows for the installation of transmission cable underground in minimally-accessible areas, such as under highways and waterways.

Simulation 4

Before After

Overhead Transmission

Intersection of i66 and Prince William PKWY • Looking East

Simulation 3

Before After

Heathcote transition station

Intersection of I-66 and Lee Highway • Looking South

Simulation 2

Before After

Underground Transmission

Above i66 • Looking Northeast

Simulation 1

Before After

View of Haymarket Substation

Above John Marshall Highway • Looking Southwest


Paper plane

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