DOE proposes ten “national interest” transmission corridors

Eight of the ten transmission corridors proposed by the U.S. Department of Energy would facilitate transmission between grid regions; one would expand transmission within the Mid-Atlantic’s PJM grid region; and one would expand transmission in the Northern Plains.

May 9, 2024 William Driscoll

DOE potential NIETC geographic areas.

Image: DOE

The U.S. Department of Energy has proposed ten National Interest Electric Transmission Corridors, as shown in the featured image above, and invites public comment on the potential NIETCs.

DOE previously sought industry input for the first stage of the NIETC designation process.

A NIETC designation, once final, “unlocks” federal financing and permitting tools to spur construction of transmission projects “to alleviate consumer harms,” DOE said. Such harms could result from transmission capacity constraints or congestion “currently or in the future,” and could show up as lower reliability or higher costs.

When transmission is congested, for example, some lower-cost renewable power must be curtailed instead of delivered to customers.

In terms of transmission financing, a NIETC designation can unlock public-private partnerships through the Bipartisan Infrastructure Law’s $2.5 billion Transmission Facilitation Program, as well as direct loans through the Inflation Reduction Act’s $2 billion Transmission Facility Financing Program.

A NIETC designation also allows the Federal Energy Regulatory Commission to issue permits for the siting of transmission lines within the NIETC if state siting authorities either do not have authority to site the line, or have not acted on an application for over one year, or have denied an application.

DOE has presented in a report its preliminary findings of transmission capacity constraints or congestion within each of the ten geographic areas that it proposed for NIETCs. Streamlined generator interconnection is one of the expected benefits of transmission development resulting from NIETC designation, DOE said.

One of DOE’s ten proposed NIETCs would expand transmission within the Mid-Atlantic’s PJM grid region, helping the PJM grid operator to maintain and improve reliability, lower consumer costs, and meet future generation and demand growth.

Another proposed NIETC in the Northern Plains would particularly aid Native American tribes to develop energy resources, stabilize energy costs and spur local economic development.

Those two proposed NIETCs reflect a finding in DOE’s National Transmission Needs Study that 54,500 GW-miles of within-region transmission must be added for a clean grid under “the most likely power sector future.”

Eight of the ten proposed NIETCs would facilitate transmission between grid regions, reflecting a finding in the needs study that interregional transfer capacities to transmit electricity between regions would need to increase by nearly 125 GW under the most likely power sector future.

Here are those eight proposed NIETCs and the regions they would connect:

A New York-New England NIETC would increase transmission capacity between the New York and New England grid regions.
A New York-Mid-Atlantic NIETC would increase transmission capacity between the New York and PJM grid regions and facilitate interconnection of offshore wind.
A Mid-Atlantic-Canada NIETC would connect the PJM grid region with a Canadian grid region.
A Midwest-Plains NIETC would facilitate interregional transmission among the PJM, MISO, and SPP grid regions.
A Delta-Plains NIETC would improve transmission between the SPP and MISO grid regions, and potentially connect the Eastern and Western Interconnections.
A Plains-Southwest NIETC would facilitate transmission among the WestConnect, SPP, MISO, and PJM grid regions, and potentially the CAISO grid region.
A Mountain-Plains-Southwest NIETC would link the Eastern and Western Interconnections and potentially facilitate transmission between the WestConnect and SPP grid regions.
A Mountain-Northwest NIETC would facilitate interregional transmission between the CAISO and NorthernGrid regions.

DOE will present a webinar on the current phase of the NIETC designation process on May 16.

DOE previously said it anticipates re-opening the NIETC designation process after each publication of its triennial National Transmission Needs Study or as determined by the Secretary of Energy.

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