June 5, 2026 Microsoft CEO Satya Nadella says the company’s newest AI data centers consume so little water that their annual usage is roughly equivalent to that of a single restaurant. The claim is based on a new closed-loop cooling system that Microsoft says allows facilities to operate with virtually no ongoing water consumption after the cooling infrastructure is initially filled.
Speaking at Microsoft Build 2026 on June 2, Nadella outlined the company’s “Community-First AI Infrastructure” strategy, which is designed to address concerns about the environmental impact of large-scale AI facilities.
“The cooling loop is filled once, and the data center can operate effectively with zero water consumption,” Nadella said during his keynote. “The daily water usage over the course of an entire year is roughly equivalent to what a single restaurant would use.”
The water savings come from Microsoft’s new cooling architecture. Traditional data centers often rely on evaporative cooling systems that continuously consume water to remove heat generated by servers. Microsoft’s newer design instead uses a closed-loop liquid cooling system that recirculates the same water rather than constantly drawing fresh supplies.
According to the company, more than 90 per cent of cooling is handled through this closed-loop approach, while the remainder relies primarily on outside air and only uses additional water during the hottest conditions.
The system works by circulating cooled water through heat exchangers connected to AI hardware. The heated water is then routed to a chiller plant, where cooling fans remove the heat before the water is recirculated back through the facility.
Microsoft says this design could save billions of gallons of water across future data center deployments.
However, the technology is currently limited to Microsoft’s Fairwater AI data center campus in Mount Pleasant, Wisconsin. The company says the design will become the standard blueprint for future AI-focused facilities, and multiple similar campuses are already under construction across the United States.
The rollout is part of Microsoft’s broader goal of becoming water positive by 2030, meaning it aims to replenish more water than it consumes globally. The announcement comes as the AI industry faces growing scrutiny over the environmental impact of rapidly expanding data center infrastructure. Large AI facilities require significant cooling capacity because the high-performance chips used for training and running AI models generate substantial amounts of heat.
Recent studies have highlighted the scale of the issue. Research published in 2025 estimated that generating a single 100-word AI-written email can consume about 519 milliliters of water when both direct cooling and electricity generation are considered.
Microsoft’s broader data center network remains substantial. Azure operates more than 500 facilities across 80 regions worldwide, many of which were built before the Fairwater cooling design was introduced. Microsoft has not announced a large-scale retrofit program for existing facilities.
