The Transmission Bottleneck: Why the Grid's Biggest Problem Is Political, Not Engineering

There is a number that ought to terrify anyone who works in the energy industry, and it does not get nearly enough attention. The United States added an average of 1,700 miles of high-voltage transmission per year between 2010 and 2020. To meet the requirements of the energy transition — to connect new renewable generation to load centers, to enable inter-regional electricity flow, and to handle the surge in demand from data centers, electrification, and reshored manufacturing; the country needs to add roughly 5,000 to 7,000 miles per year, every year, for the next two decades. We are building, charitably, a quarter of what we need to build. The gap is widening, not closing.

The reason has nothing to do with engineering. The United States knows how to build transmission. The technology is mature, the supply chain is functional (if strained), and there is no shortage of capital willing to finance it. The reason is political. Transmission lines cross multiple jurisdictions. They impose costs on communities through which they pass while benefiting consumers in distant load centers. They require eminent domain authority that is fragmented across federal, state, and local governments. And they are, in most respects, the single best example of a public good that the American political system is structurally bad at providing.

To understand why transmission is so hard to build, it helps to start with a thought experiment. Imagine you want to build a 500-mile transmission line from a wind-rich region in the Great Plains to a load center on the East Coast. The line will benefit consumers in the load center by giving them access to cheaper renewable power. It will benefit wind developers in the Great Plains by giving them market access. It will impose costs; visual, environmental, economic; on the communities through which the line passes, none of whom benefit directly from the line.

In any rational system, the consumers and developers who benefit from the line would compensate the communities through which it passes, the project would be built, and the net welfare gains would be substantial. In the American political system, this rarely happens. The communities through which the line passes have veto power through state permitting authorities, local land-use authority, and environmental review processes. They have every incentive to use that veto power to extract concessions, delay the project, or block it outright. The consumers and developers who would benefit have no comparable mechanism to pay them off. The project gets stuck.

This is not a hypothetical. The Grain Belt Express transmission line, proposed in 2010, was supposed to deliver 4,000 megawatts of wind power from Kansas to Indiana. It is still not built. The Plains and Eastern Clean Line, proposed in 2009, was abandoned in 2017 after a decade of regulatory and political delays. The TransWest Express, proposed in 2005, finally received its final federal permit in 2023; eighteen years after the project was initiated. Construction began in 2024. Commercial operation is scheduled for 2027 or 2028, depending on whom you ask. Twenty-three years, from concept to operation, for a single transmission line.

The hard truth about transmission is that there is no purely market-based solution. The coordination failures are too deep, the externalities are too large, and the political fragmentation is too entrenched. Solving the transmission problem requires the federal government to act with more authority and more political will than it has shown in fifty years. Whether either party in Washington has the appetite for that fight is unclear. Both parties claim to support the energy transition. Neither party has been willing to spend the political capital required to build the infrastructure that the transition requires.

The energy industry can, and should, make this case more forcefully. Every gigawatt of renewable generation that does not get built because there is no transmission to carry it is a gigawatt of avoided emissions that does not happen, a gigawatt of cheap energy that does not reach consumers, and a gigawatt of investment that does not get made. The cost of inaction on transmission is paid every year, by every consumer, in higher electricity prices and slower decarbonization. It is the largest single drag on the energy transition in the United States today. It deserves to be treated that way.