Satya Nadella: Microsoft’s latest Wisconsin AI data center keeps yearly water consumption no higher than that of 1 local restaurant.

"The cooling loop is filled once and the data centre can operate effectively with zero water consumption. Daily water usage across a year is roughly equivalent to what a single restaurant would use"

The mechanism is mainly about replacing evaporative cooling with closed-loop direct-to-chip liquid cooling, so water moves like coolant inside a sealed machine rather than being boiled off into the air.

Hot GB200-class AI racks produce too much heat for normal air cooling, so cold liquid is pushed through pipes into the servers and across metal cold plates touching the hottest chips.

The liquid enters the rack cool, absorbs heat from the chips through cold plates, then exits the rack at a higher temperature and carries that heat through pipes to a huge cooling system outside the compute floor.

Microsoft says Fairwater sends that hot water to cooling “fins” beside the datacenter, where 172 20-foot fans blow air across the fins and dump the heat into the outside air.

The important detail is that the air cools the water through metal surfaces, so the water does not need to evaporate the way many older datacenters use cooling towers.

The cooled liquid then returns to the servers, repeats the loop, and keeps absorbing heat from the chips.

In older data centers, heat is often removed partly through cooling towers. Hot water meets moving air, some water evaporates, and that phase change carries heat away. Effective, but it consumes fresh water continuously.

But Firwater is a closed loop because the same coolant keeps circulating through sealed pipes: it absorbs heat from the chips, releases that heat through radiator-like fins, then flows back to the chips again.

For Wisconsin Fairwater, Microsoft says more than 90% of the facility uses closed-loop liquid cooling, while the remaining portion uses outside air and switches to water only on the hottest days.

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From "Microsoft" YouTube channel, (link in comment)

Satya Nadella on Microsoft’s Fairwater data center, an AI superfactory.

at today's Microsoft Build 2026 keynote.

its vertically designed, two-story AI data center architecture.

Instead of spreading compute only across a flat floor, Microsoft can place racks in three dimensions, packing far more GPUs densely while preserving fast network access.

This helps the cluster behave more like one massive AI machine, with low latency and high bandwidth between GPUs.

The other major point is its cooling efficiency: its cooling loop is filled once and can operate with effectively zero ongoing water consumption, using roughly the annual daily-water equivalent of a single restaurant.

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From "Microsoft" YouTube channel, (link in comment)