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Memphis data-center power demand: the Colossus case

Most markets hide the grid bottleneck behind a queue. In South Memphis, xAI built around it in the open — with gas turbines.

A Gridlas analysis · public TVA / permit / reporting data · current as of late 2025

Memphis wasn't a top data-center market — until xAI chose a former appliance plant in the south of the city for Colossus, the ~100,000-GPU supercomputer it stood up in months. The problem was immediate and physical: the site's existing grid connection was about 8 MW, and the machine needed hundreds. That gap — between what a hyperscale AI cluster needs and what the grid can deliver on the timeline it's built — is the whole story of this buildout, and Memphis is where it became visible.

Rather than wait, xAI installed its own generation on site. Aerial imagery in spring 2025 showed roughly 35 gas turbines — a mix of ~2.5 MW and ~16 MW units, combined near 422 MW — burning natural gas to run the cluster ahead of any grid upgrade. The Shelby County Health Department later issued an air permit for up to 15 turbines (~247 MW) valid into 2027. In parallel, TVA approved more than 100 MW of grid supply (delivered via Memphis Light, Gas & Water) and then an additional 150 MW, as the site's projected draw climbed from 150 toward 250 MW and beyond, with a gigawatt-class "Colossus 2" in the works.

Why it matters

Memphis is the clearest real-world instance of the argument at the center of this project: the binding constraint on AI is interconnection, not generation. When a project can't wait years for a grid connection, "behind-the-meter" gas becomes the release valve — fast to deploy, but with emissions and equity costs borne by the surrounding community. Watch Memphis to see how far operators will go to skip the queue, and what that trade looks like on the ground. It's the live version of the supply-vs-demand gap the report maps nationally.