DOE Advances Three High-Priority Electric Transmission Corridors for New Powerlines

The Department of Energy (DOE) has announced three potential National Interest Electric Transmission Corridors (NIETCs) advancing to Phase 3 of the designation process, part of a broader effort to enhance the U.S. electric grid’s resilience and reliability. The designated areas, identified as critical for addressing transmission deficiencies, include the Lake Erie-Canada Corridor (spanning parts of Lake Erie and Pennsylvania), the Southwestern Grid Connector Corridor (covering portions of Colorado, New Mexico, and western Oklahoma), and the Tribal Energy Access Corridor (encompassing areas in North Dakota, South Dakota, Nebraska, and five tribal reservations).

The NIETC designation process, revised in December 2023 to include four phases, aims to identify areas where insufficient transmission capacity harms consumers and address national interests such as grid reliability and cost reduction. The current phase emphasizes public and governmental engagement, refining geographic boundaries, and assessing potential environmental, cultural, and socioeconomic impacts under the National Environmental Policy Act (NEPA) and related statutes.

These corridors were selected following public input and DOE analysis, narrowing down from an initial list of ten potential NIETCs released in May 2024. The updated list reflects the DOE’s efforts to focus on areas with urgent transmission needs, while other regions, such as the Midwest-Plains and Mid-Atlantic corridors, may be revisited in future processes.

To support transparency, DOE has released detailed maps and geographic data for the three corridors and opened a 60-day public comment period to gather feedback on the proposed public engagement framework and scope of analysis. Stakeholders are invited to contribute insights on the environmental, cultural, and socioeconomic implications of potential corridor designations. Informational webinars on each NIETC are scheduled for mid-January 2025, and DOE encourages public participation in shaping the next steps.

The DOE’s efforts align with its mandate under the 2021 Bipartisan Infrastructure Law to mitigate transmission infrastructure gaps contributing to higher electricity costs, power outages, and grid vulnerability. The agency will continue collaborating with stakeholders, including the Department of Defense, to address potential impacts on military operations and other critical concerns as the process advances.

Comments submitted during the public engagement period will inform DOE’s draft designation reports and environmental documents, anticipated later in 2025. The agency remains open to further public input and dialogue throughout the ongoing designation process.

Story by multiple RFHC contributors