The Grid They’re Leaving

There is a plain technical term for what is happening: behind the meter. A data centre that makes its own electricity on site never passes through the utility’s meter. It generates and consumes inside its own fence, invisible to the system that measures, prices and regulates everyone else. By the middle of 2026 roughly two gigawatts of behind-the-meter generation were already running in the United States, almost all of it xAI’s; the gas turbines at its Colossus site outside Memphis account for nearly 1,500 megawatts on their own. By the end of the year the total passes three gigawatts, and close to a third of all planned data-centre capacity, some 56 gigawatts of it, intends to follow.

The official framing sells this as relief. If the giants make their own power, the argument runs, they take the strain off a crowded grid. The timing says otherwise. PJM, the largest grid operator in the United States, has just missed its own reliability target for the first time in its history: about 6,600 megawatts short for 2027, with data centres driving 94% of load growth and the cost of capacity hitting a record $16.4bn. In parts of northern Virginia a new connection can now wait years. The rush to unplug is a symptom of the grid’s distress. The biggest buyers have stopped waiting for a fix and started building around it.

This is where an engineering fact turns political. A power grid is a commons in the most literal sense. It works because its fixed costs, the poles and transformers and the spare capacity held back for the worst day of the year, are spread across everyone connected to it. When the largest and most creditworthy customers leave for their own meter, they do not just take their demand with them. They take their share of the upkeep. Utility engineers have a name for what follows: the death spiral. The costs stay put, the base that pays them thins, rates rise for those who remain, and every rise hands another big user one more reason to go. What is left on the public grid is the customers who cannot build a plant of their own: homes, schools, the workshop on the corner.

The strongest objection is worth conceding, because it is true. The exit is not even clean. Behind-the-meter gas plants, by the utilities’ own reckoning, will still raise bills for people who never draw a watt from them, because they burn the gas and lean on the pipelines and system capacity that someone has to fund. So the comforting story, the rich stepping aside to free up room, does not survive contact with the details. What actually happens is smaller and colder: they build a private exit and leave the bill on the common table. The benefit is fenced off. The invoice stays shared.

The financial logic closes the circle. Electrical reliability is turning into a positional good. For a century the promise of the grid was that the light comes on the same for the factory and the kitchen. On-site generation breaks that promise and puts a market where it used to be. Call it a second grid: one that never goes dark, reserved for those who can capitalise a turbine, and the older one that risks rolling blackouts in a heatwave, for everyone else. Even seasoned antitrust hands have noticed. Jonathan Kanter, until recently the Justice Department’s top competition official, has warned that power itself is becoming the ground on which market dominance is decided. This is less a system breaking down than a system quietly splitting in two.

It is the same shape I keep tracing in these writings. Technology arrives promising to be a network that holds people together, and ends up run as a permission granted to whoever can pay for it. A data centre going behind the meter does in physical form what a closed model does in logic: it takes itself out of the shared system of measurement and rules, and keeps for itself the reliability the commons was meant to offer everyone. It is worth watching closely who, in this moment, is quietly building an emergency exit of their own. The second grid is the one they are buying. The first grid is the one you are still plugged into.