How AI data centres really use water

The claim that AI consumes water sounds odd if you picture a server as a box of electronics. The obvious objection is that the cooling water goes round in pipes. It returns to where it started, gets used again, and never goes anywhere. How can a conversation with ChatGPT consume it? The answer is that you can be looking at the wrong pipes. A sealed circuit carries heat away from the processors. A separate circuit can release that heat through a cooling tower, evaporating some of its water in the process. One loop keeps circulating while the other needs topping up. The US Department of Energy’s engineering guidance for data centres shows exactly this arrangement. A data centre can recycle its cooling water and consume water at the same time. There is no contradiction to resolve. That settles the basic question. The water consumption is real. What I find much less convincing is the confidence with which it gets attached to an individual prompt. A bottle, a teaspoon, a fraction of a…