US data centers already consume a meaningful share of the nation electricity, and the forward forecasts are climbing steeply, according to the World Resources Institute. More than 4,500 active data center facilities use roughly 176 terawatt-hours of electricity each year, about 4.4 percent of total US consumption, with over 700 additional facilities under construction across 38 states.

The forward-looking numbers show how quickly expectations have shifted. The total of five-year future summer peak demand growth forecasts published by US utilities jumped from 38 gigawatts in 2023 to 128 gigawatts in 2024, a sign of how aggressively the sector is planning for new load. Total US electricity consumption is projected to rise from about 4,110 billion kilowatt-hours in 2024 to more than 4,260 billion kilowatt-hours in 2026.

The institute also flags a forecasting problem. A wave of speculative interconnection requests from data center developers can lead to double counting and phantom load, capacity that is requested but never built. That uncertainty makes it harder for utilities and regulators to size generation and transmission investments accurately.

The data describes a sector that has moved from a rounding error in national electricity accounting to a central driver of demand growth. How accurately utilities separate real projects from speculative ones will shape both grid reliability and the cost borne by other ratepayers.

Source: World Resources Institute - https://www.wri.org/insights/us-data-centers-electricity-demand