Potomac-Appalachian Transmission Highline

Potomac-Appalachian Transmission Highline
Name	Potomac-Appalachian Transmission Highline
Status	Proposed/Partially constructed
Location	West Virginia; Virginia; Maryland
Start	Pocahontas County, West Virginia
End	Loudoun County, Virginia
Owner	Allegheny Energy Supply Company; FirstEnergy; AEP

Potomac-Appalachian Transmission Highline is a proposed high-voltage transmission project intended to move electric power across portions of Appalachian Mountains and the Potomac River corridor, connecting generation and load centers in West Virginia, Virginia, and Maryland. The proposal has intersected with infrastructure planning involving regional entities such as PJM Interconnection, national interests represented by the Federal Energy Regulatory Commission, and environmental review processes associated with agencies like the United States Fish and Wildlife Service and the National Park Service. The initiative has generated sustained public attention from utilities, elected officials from United States House of Representatives, advocacy organizations such as the Sierra Club and the American Wind Energy Association, and local governments including Jefferson County, West Virginia and Fairfax County, Virginia.

Background and purpose

The project was advanced to address transmission constraints identified by PJM Interconnection studies and to increase transfer capability between generation areas in West Virginia and load centers near Washington, D.C., Baltimore, and Northern Virginia. Proponents cited benefits cited in regional planning documents from Department of Energy assessments and National Renewable Energy Laboratory reports that aim to integrate resources like those developed by companies including NextEra Energy and Dominion Energy. Motivations also referenced reliability standards promulgated by the North American Electric Reliability Corporation and modeled needs from the Eastern Interconnection planning process. Opponents questioned projected benefits relative to alternatives promoted by stakeholders such as PJM Interconnection stakeholders, state public service commissions including the Virginia State Corporation Commission and the Maryland Public Service Commission.

Route and technical specifications

Design proposals described a high-voltage alternating current or direct current corridor traversing portions of Hampshire County, West Virginia, Berkeley County, West Virginia, Jefferson County, West Virginia, Clarke County, Virginia, and terminating near Loudoun County, Virginia. Technical documentation referenced transmission technologies in use by carriers like American Electric Power and FirstEnergy and compared conventional lattice towers to alternatives used by National Grid and TransAlta. Specifications discussed voltages comparable to other major projects overseen by Federal Energy Regulatory Commission-jurisdictional entities, and capacity considerations paralleled upgrades cited in U.S. Department of Energy transmission studies. Right-of-way, tower height, conductor type, and substation interconnections were evaluated against precedents such as corridors managed by Bonneville Power Administration and regional projects approved by PJM Interconnection.

Environmental and cultural impacts

Environmental reviews involved assessments of habitat for species listed by the United States Fish and Wildlife Service, impacts to waterways including tributaries of the Potomac River, and potential effects on landscapes recognized by the National Park Service and the Advisory Council on Historic Preservation. Cultural resources considered included historical sites tied to Shenandoah Valley history, places associated with Civil War events, and structures within districts recorded by the National Register of Historic Places. Conservation organizations such as the Sierra Club and the National Trust for Historic Preservation raised concerns about visual impacts, fragmentation of forested tracts like those in the George Washington and Jefferson National Forests, and potential effects on recreational resources overseen by state parks such as Shenandoah National Park neighbors. Environmental assessments referenced standards in statutes like the National Environmental Policy Act and consultations with agencies including the Environmental Protection Agency.

Stakeholder positions and political controversies

Utilities and developer entities argued the project would support reliability obligations articulated by North American Electric Reliability Corporation and facilitate integration of renewables advocated by groups like the American Wind Energy Association and the Solar Energy Industries Association. State officials and members of Congress from Virginia and West Virginia became involved, with representatives from delegations in the United States Congress expressing support or opposition; organizations such as the Sierra Club and local landowner associations organized campaigns and hearings. County governments including Jefferson County, West Virginia and Loudoun County, Virginia adopted resolutions and pursued local planning processes; state regulators such as the Virginia State Corporation Commission reviewed cost allocation and rate impacts. Litigation and legislative maneuvers involved actors from the United States Court of Appeals for the District of Columbia Circuit and state legislatures where lawmakers referenced precedent cases involving Federal Energy Regulatory Commission authority.

Regulatory approvals and legal challenges

Approval processes required interaction with federal entities like the Federal Energy Regulatory Commission and federal environmental reviews under the National Environmental Policy Act with input from the United States Fish and Wildlife Service and the National Park Service. State-level permits and certificatory actions involved the West Virginia Public Service Commission, the Virginia State Corporation Commission, and the Maryland Public Service Commission. Legal challenges were mounted in various forums, including federal courts such as the United States District Court for the District of Columbia and state courts addressing eminent domain matters, right-of-way approvals, and compliance with environmental statutes. Precedent legal decisions cited projects reviewed by the Federal Energy Regulatory Commission and disputes involving entities such as Dominion Energy and American Electric Power.

Construction, timeline, and current status

Project proponents provided proposed timelines influenced by permitting schedules similar to other large transmission projects like those built by Bonneville Power Administration and corporate transmission investments by American Electric Power. Delays resulted from contested environmental reviews, litigation, and stakeholder negotiations involving county boards of supervisors, state commissions, and federal agencies, affecting planning milestones and construction start dates. As of the most recent public filings, portions of planning, studies, and outreach remained active while formal construction and energization awaited final permits and resolution of pending legal challenges involving parties including utilities and advocacy organizations.

Category:Energy infrastructure in Virginia Category:Energy infrastructure in West Virginia