AI Data Centers Cut Local Water Use But Increase Power Plant Consumption

Advanced cooling technologies are allowing AI data centers to dramatically reduce their direct water consumption, but the trade-off is forcing a larger environmental burden onto electricity generators in water-stressed regions. New liquid-cooling systems circulate coolant at temperatures up to 45°C through closed loops with zero direct water loss, cutting facility cooling water consumption from roughly 2.6 million gallons per megawatt per year to near zero in favorable climates. Microsoft has claimed its latest generation of AI data centers uses so little water annually that consumption is roughly equivalent to a single restaurant. NVIDIA's designs eliminate traditional evaporative cooling towers entirely, saving a 50-megawatt facility over $4 million annually in cooling-related energy and water costs. Yet the industry faces an inconvenient reality: these efficiency gains mask a larger environmental shift. According to Berkeley Lab data, while data centers directly consumed 66 billion liters of water in 2023, the water required to generate the electricity powering them totaled approximately 800 billion liters—roughly 12 times the direct cooling requirement. The advanced cooling systems often increase peak electricity demand by 6 to 35 percent compared to evaporative methods, intensifying reliance on thermoelectric power plants that consume about 0.47 gallons of water per kilowatt-hour. Power plants supplying U.S. data centers consumed an estimated 211 billion gallons of water in 2023. Coal-powered plants carry particularly high water intensity at 19,185 gallons per megawatt-hour, while natural gas averages 2,803 gallons per megawatt-hour. As data center electricity demand grows from 4 percent of U.S. consumption today to a projected 6.7 to 12 percent by 2028, roughly two-thirds of new facilities have been sited in regions facing medium-high to extremely high water stress. The technology shift essentially relocates the water burden from the data center to the power grid—and in many cases, to power plants operating in watersheds already facing critical scarcity. Some industry observers have sought ways to address this through power purchase agreements with renewable energy sources, which reduce water intensity by eliminating thermal power generation entirely. But as long as data centers remain tethered to regional electricity grids powered partly by thermoelectric plants, the water savings achieved on-site remain offset by accelerating consumption upstream.