Global data center electricity consumption will grow 26% in 2026 to reach 565 terawatt-hours (TWh), up from 447 TWh in 2025, according to a recent Gartner forecast that names power availability as a binding constraint on AI expansion. Worldwide power demand is set to rise 27% to 132 GW over the same period, up from 104 GW in 2025, with consumption projected to exceed 1,200 TWh by 2030. The gigawatt figure measures peak capacity that has yet to be built, permitted, and connected, while the terawatt-hour figure measures the electricity actually drawn over the year. Both, however, are climbing faster than utilities can add supply.
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