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Line 514 Corridor Upgrade
At Dominion Energy, we are committed to continually reviewing and analyzing our energy infrastructure to provide the most safe and reliable electric service. This project will address aging electric transmission infrastructure in Loudoun County while adding power and increasing reliability in the region.
Overview
The Line 514 Corridor Upgrade project will replace aging equipment, provide additional power to the region due to growing economic development, and help maintain overall grid reliability. The original purpose of this project was to replace outdated structures and conductors. However, through the PJM Open Window process, this corridor was identified to be optimized with additional infrastructure in partnership with other regional utilities. The current corridor has an existing 500 kV lattice structure and a double circuit 230 kV monopole. The new design will have two 500/230 kV monopoles and another 500 kV monopole. While these new and rebuilt lines will connect with First Energy, PEPCO, and NextEra lines at the Potomac River crossing, Dominion Energy will construct and maintain the lines from the Potomac River to existing substations approximately three and a half miles south near Leesburg. This project will stay within the existing right of way. A public re-announcement of this updated project is targeted for Q4 2025, with additional outreach and an in-person open house in January of 2026. The estimated filing date with the SCC is Q1 2026.
We're designing and constructing this project to meet today's safety and reliability standards - so you can get the power you need, when you need it.
Three primary forces drive the need for new electric transmission infrastructure:
- Economic development, such as population growth or business expansion
- Aging assets, such as decades old structures that need to be replaced
- Complying with mandatory standards to ensure safety and reliability
Benefits
- Maintains current right of way
- Replaces aging infrastructure
- Comply with mandatory standards to ensure safety and reliability
Timeline
- May 2025–January 2026 – Outreach to the community
- January 2026 – In-person and virtual community meetings
- Q1 2026 – Target filing with SCC
- Early 2027 – Anticipated SCC approval
- Mid-to-Late 2027–2030 – Tentative construction schedule
Legal
The Virginia State Corporation Commission (SCC) has regulatory authority over all energy providers in Virginia and requires certification for all transmission lines out of the ordinary course of doing business. or are at or above 138 kV. Among other responsibilities, the SCC validates the need for a proposed line and approves the route and structures. In reviewing a proposed project, the SCC must consider whether potential impacts on scenic assets, historic districts and the environment have been reasonably minimized.
To learn more about this process, please view our SCC application review process.
Current Procedural Schedule
The revised SCC application target is the first quarter of 2026.
Previous Procedural Schedule
(for previous application)
The following key dates and developments are related to the SCC review timeline. For the most up-to-date and full listing of motions, rulings and other related documents, please refer to the SCC docket for this case. On July 26, 2022, the SCC issued its Final Order authorizing Dominion Energy to proceed with this project.
Application Documents
Maps and Simulations
Current project maps and simulations
- Maps and Simulations – September 2025
Previous project maps and simulations
Powerlines 101 - Learning Zone
Learn how the energy grid works; along with our processes to build and maintain electric transmission lines.
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