OVERVIEW of Mid-Atlantic Resiliency Link (MARL) 500kV
MARL is part of the over $5 billion in new transmission lines approved by PJM to support the projected 7,500 megawatts of new data centers in Northern Virginia as well as to compensate for the planned retirement of 11,000 MW of fossil fuel generation in its eastern region.
MARL starts at the 502 Junction and is a giant extension cord from West Virginia’s coal fired plants - specifically the Fort Martin Power Station, Harrison Power Station and the Mitchell Power Station - into the ‘heart’ of data center alley in Northern Virginia. All three of these generators are coal-fired and together total nearly 5,000 MW of capacity and according to PJM have excess capacity that can be tapped to support the development of new data centers (@117 )and expansion of the existing 200 data centers. Four transmission companies will be building segments of this line : NextERA, FirstEnergy, Dominion & PG&E across four states.
Both of the First Energy of power plants are reaching the end of their useful life within the next 10 to 15 years, at best this is a partial / temporary solution to the present energy shortfall in Virginia's data center region. A better solution would be for the Data Centers to locate closer to the generation plants with excess capacity or to build additional generation in Virginia to meet the demand.
PJM doesn't have a transmission reliability issue, the region has a lack of base load generation in Virginia issue.
If approved in all 4 states, this line will traverse :
NextERA is to build the portion of the transmission line through :
First Energy is to build the portion of the transmission line through :
At the request of Loudoun County, PJM moved a portion of the transmission line farther out into western Loudoun County and into Maryland. The Alternate MARL Route was approved by PJM in August of 2024, this route crosses 15 miles of far Western Loudoun along the Potomac River crosses the Potomac River into Maryland and runs through Frederick and Montgomery counties in Maryland before crossing the Potomac River back into Loudoun County near Ashburn. This added $167M in cost, pushed the in-service date to 2032 and added two additional segments:
This transmission line will also cross the Monongahela National Forest, Appalachian National Scenic Trail, Chesapeake & Ohio Canal National Historical Park, Harpers Ferry National Historical Park, Potomac Heritage National Scenic Trail and it will run parallel down the view shed of the Potomac River.
The MARL Transmission Line application has not been submitted to the VA SCC yet .
Check out the Alerts & Actions page for opportunities to participate, speak out , and make your voice heard!
If your property is in the Neersville or Lovettsville area , get ready to intervene at the Virginia SCC by requesting an eFiling account. You do NOT need a lawyer you can intervene "pro se" and represent yourself!
NextERA has started working its routing study in Green and Fayette counties in Pennsylvania; Preston , Monongalia, Mineral and Hampshire counties in West Virginia; Garrett and Allegheny counties in Maryland
Highlights:
In Maryland NextERA has worked with elected officials to propose a bill to allow it to build the transmisison line through the Wildlands in Western Maryland. HB1270 specifically names Big Savage Mountain Wildland, Bear Pen Wildland and Dan's Mountain Wildland and specifically references NextERA .
There does not need to be a choice between rural private property owners or wilderness conservation areas in Maryland. The choice is whether these lines are sited through Maryland at all.
Comments include a summary of the MARL transmission line, the extent of the data center load issue in Loudoun County, the impact of transmission lines on property valuations and options for Virginia to address the energy demands of the Loudoun County Data Centers that avoids impacts to Maryland entirely.
One of the reasons for the selected primary route for the MARL transmission line is to use an existing Appalachian Trail crossing. There are three highways (Route 7, Route 9 and Route 50) that also cross the Appalachian Trail to the south / south west of the existing Mt. Storm - Doubs transmission line crossing. "Data Center Alley" - the destination for all this power is on Route 7. Additionally, both Route 7 and Route 9 run directly to / towards "Data Center Alley". Using highway easements of any one of these would avoid taking private property to host the MARL transmission line. NextGen Highways advocates for using existing highway ROWs to co-locate infrastructure such as transmission lines ,they can be contracted with to study the feasibility of routing transmission lines along highways. In 2022 NextGen Highways did a feasibility study for Minnesota Department of Transportation for Buried High Voltage Direct Current Transmission. The study concluded buried HVDC is cost competitive.
HVDC lines can be buried underground in a right of way that is only 5ft wide by 5ft deep and can be used for both long and short distances. In 2022 NextGen Highways did a feasibility study for Minnesota Department of Transportation for Buried High Voltage Direct Current Transmission. The study concluded buried HVDC is cost competitive. There are about seven recent HVDC transmission projects on the United States many of which contain significant segments that are buried.
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