The data center bottleneck moves to the substation

Behind a record 37.7 gigawatts of data center capacity under construction across the Americas sits a figure that should discipline an underwriter: 91.7 percent of that pipeline is already precommitted. With vacancy at 3.8 percent against 50.3 gigawatts of operating stock, the development number keeps climbing because the standing stock is absorbed that easily.

But the number that strains belief is further out. Cushman's H1 2026 Americas Data Center Update puts the planned pipeline at 285 gigawatts, nearly six times everything running today, and no queue in the region is expanding at six times anything. That is a claim on land, water, transformers and interconnection queues rather than a forecast of buildings. For a property type that has spent years being underwritten as the one place demand outruns supply, the binding constraint has flipped from the slab to the wire.

John McWilliams, who leads data center insights at Cushman, frames the change around what makes a market competitive rather than what makes a tenant sign. Demand, in his telling, is settled; the availability of power and infrastructure, and the regulatory certainty that determines how fast either arrives, is not. That redrawing shows in the two lists Cushman keeps: Virginia, Atlanta, Chicago and Dallas continue to attract capital on connectivity, customer concentration and mature infrastructure, while West Texas, Pennsylvania, Alberta and Cheyenne are appearing for something less familiar to a real estate committee—power that is available and a shorter path to it.

As this publication has argued, the data-center trade stopped being a leasing story some time ago; the energy, land and regulatory calendar now sets the price of construction risk, and debt markets have begun charging for it while equity has not. The 285-gigawatt pipeline is the measure of that gap: it cannot be energized on the schedule its sponsors are implying, which makes the scarce asset a firm interconnection agreement and a utility willing to commit to a date rather than the cheapest acreage. Sites that lack both will keep showing up in development reports and keep losing pre-leasing to the four hubs.

A related pattern holds across the wider property market: the recovery running on supply rather than silicon is what hands owners leverage when construction stops. Data centers have pushed that shortage upstream of the contractor, into equipment and capacity no developer can build for itself.

The update gives a single Americas figure of 91.7 percent, but the precommitment split by market will show whether power is being priced into these deals or merely described. If the emerging locations hold anywhere near it, power is being priced; if the record pipeline leans on the hubs while the periphery carries the megawatts on paper, it is being described.