Datacenter power demand is outrunning the US grid by roughly tenfold

Howden finds datacenter power use has grown about ten times faster than US grid capacity, pushing operators toward self-generation.

Insurance broker Howden, drawing on US Energy Information Administration and S&P Global data, found that power supplied to US datacenters has grown about ten times faster than grid capacity. Since 2000, power going to data campuses has risen about 19 percent a year on average, while grid capacity has grown about 2 percent a year.

The result is a large shift in share. Datacenters took roughly 5 percent of US grid capacity in 2025, up from 0.1 percent in 2000, a 50-fold increase. Howden calculates that to stop that share from growing, datacenters would need to source up to 58 percent of their power off the grid by 2030. Holding them at 5 percent would take 110 gigawatts of behind-the-meter capacity by 2030, an expansion Howden itself considers unlikely. It expects a mix instead: more grid reliance, slower development at power-constrained sites, and alternative power supplies.

This matters for abundance because compute is increasingly the input that makes intelligence cheap, and power is now the limiting factor on building it. For the largest power-constrained projects, Howden estimates grid delays of two to six years could cost $800 million to $2.4 billion in forgone revenue. Delays like that slow how quickly AI capacity, and the knowledge services built on it, can scale. Self-generation can route around the queue, but Howden's head of Natural Resources, Stuart Adam, has pointed out that it brings new operational and financial exposures for operators.

The pressure is not new. Gartner warned in June that AI datacenter energy use is on track to grow 26 percent this year and that grid supply may not keep pace by the end of the decade. Bain & Company said two years ago that server farm energy draw is expected to more than double by 2030.

Two caveats. Howden is an insurer with a commercial interest in on-site generation risk. And datacenters are not about to consume all US electricity in the near term. Watch for how much new generation and grid investment actually arrives by 2030.

Source: The Register