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Trowbridge Solar Interconnection and Transmission Line Rebuild
Overview
The purpose of this project is to connect the Macadamia Solar generation facility in Washington County, North Carolina, to the electric transmission grid while maintaining reliable grid operation. There are three main components of this project:
1. Expand Trowbridge Substation in Washington County.
2. Expand right of way corridor by 20 feet and rebuild a 1.5-mile section of Line 25 in Martin and Washington counties.
3. Rebuild 20 miles of Line 218 in Martin and Pitt counties from Everetts Substation to our interconnection with Duke Energy in Greenville.
Benefits
- New structures located in the same general location as existing structures
- Complies with mandatory standards to ensure safety, reliability and to meet future needs
- Replaces aging infrastructure
- Strengthens area reliability
- Connects renewable resources to the electric grid.
Documents
Documentos en español
Maps
Explore the Backyard Application, a structure height comparison tool. You can:
- Use the address search to see structure locations in your area
- View details about individual structures
- Use the legend to understand structure changes
Legal
PJM Interconnection Documentation
FAQs
All proposed interconnections of electricity generation resources with a capacity of 20 megawatts or more are managed through a comprehensive process involving the generation owner, transmission owner, and regional transmission operator, PJM Interconnection. The process includes studies and analyses to identify grid impacts and facilities requirements driven by new renewable energy coming onto the grid by proposed generation resources. The renewable project developers may also build electric transmission infrastructure to connect the renewable generation resource to existing Dominion Energy grid infrastructure.
All elements of the electric grid are interconnected. New electric generators and energy-drawing sources in one area can impact elements of the grid in locations miles away. As part of the system impact and facilities studies for proposed generation sources discussed in the response to question one, the regional electric transmission grid is studied to determine where upgrades may be needed to maintain adherence with NERC reliability standards when the new facility comes online. In this case, in order to interconnect the Trowbridge Project, we need to rebuild Line 218 to maintain system reliability.
Costs for new and upgraded electric transmission infrastructure driven by generation interconnections, including renewables, are the responsibility of the generation owner (project developer).
Timeline
Upcoming
Spring 2028
Final restoration of impacted areas
Late 2027
Construction Complete
Early 2026
Begin Line 25 partial rebuild and Trowbridge Substation construction
Fall 2025
Begin Line 218 rebuild from Everetts Substation to Greenville Interconnection
Fall 2025
Site preparation activities: Access roads, forestry, and right of way preparation
2024
Spring 2024
Project kickoff, engineering, and permitting
March 2024
Project announcement mailed to neighbors
Construction-Related Impacts
Service Interruption
Your electric service is not expected to be impacted by this project.
Neighborhood
Access to surrounding neighborhoods will not be impacted.
Traffic
There may be some traffic delays.
Noise
Noise levels will be minimal; permits are in place.
Environment
This project may have limited environmental impacts.
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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