Climate 411

The U.S. needs to build a lot more high-voltage electric transmission lines. Our current system is disconnected in all of the wrong places, leaving bountiful renewable resources stranded, individual regions isolated, and disadvantaged communities with unreliable power and exorbitant costs. Even where we do have connections, many of the lines are outdated and can’t accommodate all of the energy that is being produced.

To ensure that our grid is resilient to severe storms and heat, capable of meeting our climate goals, and can deliver energy at reasonable cost, we will need to build or upgrade around 75,000 miles of transmission lines – the equivalent of building 30 transmission lines connecting Los Angeles to New York City.

Historically, building transmission lines over long distances has been an arduous and time-consuming process. Many lines have taken decades to reach completion, while others don’t even make it to the construction phase. Since transmission lines typically pass through many separate state and local governments, transmission developers are required to apply for a permit with each of the individual states, and potentially the individual municipality that it crosses. Each of these state and local processes can take years, leading to potentially cascading timelines, particularly for longer distance projects. And of course, any of these permitting bodies could simply deny the project from being sited in their state or local jurisdiction, setting off further actions and delays that a transmission developer will need to respond to, if they don’t simply throw in the towel.

But there is a small exception to this sluggish process: a transmission line that is being built within a specific Department of Energy (DOE) designated “corridor” and that did not receive a construction permit from a state or local agency within one year of filing their application may seek a federal permit from the Federal Energy Regulatory Commission (FERC) to move forward with their project.

In May, DOE proposed 10 National Interest Electric Transmission Corridors (NIETCs, pronounced Nit-Sees). These NIETCs represent areas where DOE has found that new interstate transmission could provide outsized benefits to consumers affected by high electricity costs and reliability concerns. Transmission lines built in these corridors will become eligible for additional financial support under the Inflation Reduction Act and Bipartisan Infrastructure Law. These proposed designations represent a necessary step forward in the process of getting more transmission lines in the ground. However, whether these corridors can deliver on their promise of removing barriers to building new transmission projects depends on where the boundaries are drawn, and whether they include the range of reasonable alternative routes that a developer may need to consider.

An analysis commissioned by EDF found that the boundaries of the corridors were drawn far too narrow, unnecessarily excluding existing infrastructure corridors and their rights-of-way — such as highway and railway routes — that can create more pathways for delivering reliable and affordable power.

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