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Brambleton-Mosby

Needs

  • Aging infrastructure - The structures and equipment are reaching the end of their expected service life.
  • Growth in local and regional demand - Dominion Energy's service territory continues to be one of the fastest growth areas in PJM and Loudoun County.

Benefits

  • Reduces the risk of a major failure of the high-voltage network
  • Improves local and regional electric reliability
  • Increases capacity of the lines through the corridor
  • No new right-of-ways required

For more information on construction activities on the western half of this same corridor, refer to the Loudoun-Pleasant View Project. This project was approved by the SCC in April 2014, and construction has begun at the northern end, near Pleasant View substation, and will proceed south toward the Loudoun Substation.

Northern Virginia Electric Cooperative (NOVEC) has received approval to build a service center at the Brambleton Substation location on Evergreen Mills Road. For information related to this project, please contact Kent Cassell, NOVEC Manager, Procurement, Materials and Facilities: 703-392-1592 or kcassell@novec.com.

Construction Update

  • October 2016 - Line construction is complete and the line is energized. Work continues at the Brambleton Sub; rehab work is also underway.

Overview & Project Description

The south terminal substation for the new line will be Mosby Substation (adjacent to Loudoun Substation on Lightridge Farm Road) and the north terminal substation will be the existing Brambleton Substation located just south of Evergreen Mill Road.

Rebuilding this line will replace structures at, or very near, the current locations with new structures, approximately 20 feet taller (subject to final engineering). The existing double-circuit 230kV towers on the eastern half of this corridor will be replaced with new structures to accommodate one 500kV line and one 230kV line.

View the Dominion Energy and NOVEC Joint Presentation - Meeting with Willowsford and Brambleton Residents (Dec. 8, 2015)

Maps

Photo Simulations

Simulations of the proposed transmission structures are available below and are provided by Truescape

Photo simulations and diagrams provide representational views of proposed electric transmission facilities. These illustrations do not necessarily depict exact structure design or physical placement. All projects are subject to change and to final engineering.

Simulations along the transmission line corridor -- Each file includes three views: the existing view, the future (2015) view once the Loudoun-Pleasant View 500kV Rebuild Project is complete (new structures on the western side of the corridor), and the final configuration (2016-2017) once the proposed Brambleton-Mosby 500kV project is completed (new structures on the eastern side of the corridor).

Timeline

SCC Project (transmission line)

  • Winter 2017 - Energize rebuilt line, rehab activities to follow
  • Winter 2015/2016 - Initiate construction activities
  • May 2015 - SCC grants project approval
  • August 2014 - Filed application with Virginia SCC
  • Summer 2014 - Outreach to stakeholders and regulatory entities 

Brambleton Substation

  • September 2016 – Perimeter security fence construction
  • November 2015 – Earthen berm and landscaping installation
  • March 2015 – GIS (gas insulated substation) enclosure construction

SCC Applications

The State Corporation Commission (SCC) is responsible for determining the need, route and environmental impact of transmission lines at 138kV and above in Virginia. To learn more about this process, view our SCC process map.

Documents related to this project, (case number PUE-2014-00086), are available on the SCC website.

Northern Virginia Electric Cooperative (NOVEC) has received approval to build a service center at the Brambleton Substation location on Evergreen Mills Road. For information related to this project, please contact Kent Cassell, NOVEC Manager, Procurement, Materials and Facilities: 703-392-1592 or kcassell@novec.com. The NOVEC facility plan includes an approximately 16,000 square foot, two-story main building that will serve as a central assembly and dispatch location for field employees and a small administrative staff. The main building will also include a 7,000 square foot warehouse adjoining a materials storage yard.

FAQs

What are the alternatives for routing the lines and towers near the Brambleton Substation?

Because the existing right of way is adequate to construct the proposed project on the eastern half of the corridor (and the already-approved project on the western half of the corridor), no new right of way is necessary. Given the statutory preference to use existing rights of way to avoid additional costs and environmental impacts, the Company will proceed to optimize the use of the existing corridor as already built south of Loudoun Substation.

How will Dominion Energy address concerns related to lighting, noise and visual screening?

  • Substation Noise - Dominion Energy is investigating the installation of architectural panels along the western side of the substation parcel that will comply with federal security standards while providing visual and noise mitigation.
  • Vegetation Screening - Dominion Energy is considering several options such as planting additional landscaping along the western/Willowsford side of the substation parcel. Any additional planting will need to comply with all regulations for mature plant height in proximity to the NOVEC and Dominion Energy  facilities.
  • Substation Lighting - The existing bright lights inside the station are temporary and will not need to be constantly on once the new perimeter fence is in place (fence construction begins mid-2015). Future security lighting will be programmed to turn on by our operators in the event light is needed.

Could we consider another location, such as the Goose Creek Substation for the future work planned at Brambleton Substation?

Dominion Energy is not able to use the Goose Creek Substation, or any other site, for the work that is planned at the Brambleton Substation for reasons related to two projects regulated by the Virginia State Corporation Commission (SCC).

  1. The Loudoun-Pleasant View Substation 500kV Rebuild Project has already been approved by the SCC and construction is underway. This project will require replacing the transmission line structures on the western half of the existing right of way.
  2. The GIS building (Gas Insulated Substation) at the Brambleton Substation will support the proposed Brambleton-Mosby 500kV Project. If approved by the SCC, the new transmission line would replace structures running approximately five miles on the eastern half of the existing corridor from Brambleton Substation to Dominion Energy’s Mosby Substation. It is not possible for us to install the GIS building in the Goose Creek Substation to support this project. The GIS installation allows Dominion Energy to install necessary equipment that supports the transmission network without expanding the footprint of the existing Brambleton Substation.
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