The Cloud's Water Bill Is 12 Times Bigger Than Reported

Every AI query, every cloud backup, every streamed video runs through a data centre somewhere. A single large one, 100 megawatts, uses as much electricity as 100,000 households. The cloud runs on a scale of water and power that most people never see — and the most commonly cited number for it is roughly twelve times too small.

Start with electricity, since it explains the rest. US data centres consumed 176 terawatt-hours in 2023, about 4.4% of national electricity, projected to reach 12% by 2030 (Lawrence Berkeley National Laboratory, 2026). Virginia's data centres alone now account for almost 40% of the state's total consumption. Meta's Hyperion project in Louisiana will require at least 5 gigawatts on its own — three times what New Orleans uses (Consumer Reports, 2026).

The water figure usually quoted, 17 billion gallons a year for direct cooling, is the smallest part of the real number. That's the water a facility uses on-site. It excludes the water consumed by the power plants generating its electricity in the first place — and the same federal research that produces the 17-billion figure puts that indirect total at roughly 211 billion gallons a year (EESI, 2026; Lawrence Berkeley National Laboratory, 2026). Coal plants alone consume close to 19,185 gallons of water per megawatt-hour produced. Indirect consumption outweighs direct consumption by more than 12 to 1 — meaning the number that gets repeated in most coverage captures less than 8% of the actual footprint.

The concentration is local, not just national. Nationally, data centre water use is roughly 0.3% of public supply — small. But nearly half of US capacity clusters in five regions, several of them already managing drought. In The Dalles, Oregon, one company's water use roughly tripled over five years while the town's population grew 12%, and reports put its share of the town's total water consumption near 30%.

The industry's own counter-evidence is real and worth weighing fairly: Amazon has cut water use per unit of server capacity by 40% since 2021, and Google now replenishes most of what it withdraws. Efficiency is genuinely improving per query. The catch is the same one that shows up everywhere technology gets more efficient — total use keeps climbing anyway, because falling cost per use multiplies how often it gets used. The infrastructure is being built faster than the accounting for it.