North Plains Connector Clears Final Environmental Review for 3 GW East-West Grid Link
The North Plains Connector has reached a major federal and state permitting milestone after DOE and Montana regulators released the project's Final Environmental Impact Statement for a proposed 3 GW HVDC transmission link between Montana and North Dakota.
Microgrid Media Editorial Desk
Published · 3 min read
The North Plains Connector reached a major federal and state environmental-review milestone on August 28, 2026, after the U.S. Department of Energy and Montana Department of Environmental Quality released the Final Environmental Impact Statement for the proposed high-voltage transmission project between Montana and North Dakota. The planned system would create 3,000 MW of bidirectional transfer capability between major U.S. power regions.
The project calls for approximately 422 miles of transmission infrastructure, including a 525-kV high-voltage direct-current line and associated alternating-current facilities. According to the Department of Energy’s August 28 announcement, the line is designed to increase transmission capacity, expand access to generation and strengthen the ability to move electricity between regions as power demand grows.
North Plains Connector would provide 3 GW of transfer capacity
The proposed line would run between Colstrip, Montana, and North Dakota and connect portions of the Western and Eastern Interconnections. DOE describes the project as a means of allowing electricity to move in either direction depending on system conditions, potentially giving grid operators access to a broader pool of generation during periods of high demand or constrained supply.
The Final Environmental Impact Statement evaluates construction and operation of the 525-kV HVDC line, three associated AC transmission lines and auxiliary facilities.
That type of additional transfer capability is becoming increasingly important as utilities and grid operators contend with changing generation patterns and rapidly growing electricity loads. Microgrid Media has previously examined how interconnection reforms are being considered to unlock additional grid capacity in PJM, where lengthy development timelines have complicated efforts to bring new generation online.
Final EIS moves the project through a major review stage
The environmental document does not itself mean construction is approved or imminent. Instead, it completes a major stage of the federal and Montana environmental-review process and provides regulators with an analysis of potential environmental effects, alternatives and mitigation measures.
The Montana Department of Environmental Quality said the Final EIS was prepared jointly with DOE and follows the developer’s application for a Major Facility Siting Act Certificate of Compliance.
The U.S. Environmental Protection Agency also published the availability of the Final EIS on August 28, formally placing the document into the federal environmental-review record.
Regional transmission is taking on greater importance as electricity demand rises
DOE explicitly connected the project to rising electricity demand and the need for greater regional reliability. A transmission link capable of moving several gigawatts between regions could become especially valuable when generation availability and demand conditions differ across neighboring power systems.
Those reliability questions are becoming more consequential as large industrial and computational loads connect to the grid. Microgrid Media recently reported on NERC’s reliability requirements for rapidly changing data-center and computational loads, which are forcing transmission planners to examine how unusually large new loads behave during normal operations and grid disturbances.
The North Plains Connector would not eliminate regional generation or transmission constraints, and the Final EIS does not establish the project’s ultimate construction schedule. It would, however, provide a new 3 GW pathway for exchanging electricity between regions that historically have had limited direct transfer capability.
What happens next
The release of the Final EIS allows the North Plains Connector to proceed through subsequent federal, state and project-specific approval processes.
Those steps will determine whether the proposed route, converter stations, transmission facilities and associated infrastructure receive the authorizations necessary for construction. Project economics, procurement, final engineering and construction scheduling also remain separate from the environmental-review milestone.
For the power sector, the August 28 decision is significant because the North Plains Connector has moved beyond the draft environmental stage toward the regulatory decisions that will determine whether a new 3 GW East-West transmission pathway is ultimately built.
The Microgrid Media Editorial Desk reports on microgrids, energy storage, grid modernization, data center power demand, distributed energy resources, and energy policy. Reporting published under the Editorial Desk byline is developed from primary regulatory records, utility filings, government documents, company disclosures, and independently verifiable sources, and is reviewed under Microgrid Media’s editorial standards.
Editorial oversight: Jonas Muthoni, Editor-in-Chief
