North Plains Connector’s final environmental review advances a 3,000 MW grid link
DOE and Montana reached a review milestone for the proposed connection between eastern and western power networks.
The proposed North Plains Connector has reached a major environmental-review milestone with publication of its final environmental impact statement by the U.S. Department of Energy and Montana Department of Environmental Quality.
The agencies released the document August 28. It addresses the proposed 422-mile, 525-kV overhead high-voltage direct-current line between Colstrip, Montana, and North Dakota.
DOE describes a planned 3,000 MW of bidirectional transfer capability linking the Western and Eastern Interconnections. The final review incorporates public feedback and revisions to impact projections as the route and construction approach developed.
The publication is an important step in project development. It does not itself mean that the line has been built or that transfer capability is available to the grid.
For power planners, a connection between networks is valuable because it creates another way to move electricity across regional boundaries. The delivery question is how that proposed capability progresses through remaining decisions and physical construction.
Environmental review also supplies information that can affect construction planning. Route constraints and commitments need to travel into design documents and contractor responsibilities rather than remain in a separate approval record.
This August milestone is worth tracking in the wider transmission pipeline because it records a specific completed review stage. Subsequent approvals, contracting and construction progress will determine when the proposed connection can become an operating asset.
Reporting source: U.S. Department of Energy, August 28, 2026. Sources reviewed September 30, 2026. Delivery implications are Infraday analysis.
Illustrative photograph; it does not document the announced work. High-voltage transmission tower; representative photograph. Photo: Novoklimov / CC BY 4.0. No editorial alterations; WordPress may resize or crop for display.
