Port Washington

Vantage Data Centers (for OpenAI) · Port Washington, Wisconsin

Not built yet. Every figure below is what it would take and emit at the capacity its owners have announced.

Water — consumed, not returned

Where the water comes from

Closed loop — negligible draw

Cooling

Closed-loop liquid

Basis

Modelled from cooling design — WUE 0.05 L/kWh

Air — what the stacks emit

Where it burns

PJM RFC — Ohio / Penn.

Generation mix

Gas 48 · Nuclear 27 · Coal 20

CO₂e

3,310 kt/yr — climate, not air quality

Who wanted it

Who asked for it

OpenAI — Vantage develops; announced as a Stargate site in 2025

Who approved it

City of Port Washington annexation and TIF; We Energies supply, with a new gas plant proposed at Oak Creek partly to serve data center load

What it serves

OpenAI compute under Stargate

IT capacity

0 MW running of 1,000 MW announced

On the Lake Michigan shore, where water is abundant but Great Lakes Compact rules govern any diversion. The binding constraint here is power, not water — We Energies has proposed new gas capacity to cover it.

Where it is

43.3872°, -87.8756°

Google Maps Satellite See it on the map

Water and air figures are modelled from disclosed capacity, not measured — site-level error is roughly ±40%. Diesel backup generators are not counted, so on-site figures are floors. Full method.