California tightens rules on AI data center energy and water use

California Governor Gavin Newsom signed seven bills on September 21 aimed at the state's fast-growing AI data center industry. The package requires operators to pay for upgrades to local power grids and water systems rather than passing those costs on to residents.

What the new laws require

Under the legislation, the California Public Utilities Commission must create a new rate classification for data centers. Facilities will have to cover the cost of grid upgrades, comply with the state's energy procurement rules and add new clean energy supply to the grid — measures intended to stop cost shifts onto ordinary ratepayers.

Proposed data centers will also have to tell local governments and water suppliers how much water they expect to use, along with information on energy efficiency, supply and drought planning. Any water infrastructure needed to serve a project is to be paid for by the developer.

Land use and fast-track approvals

The package ends blanket environmental exemptions for data centers. A project must show that it will not shift costs to ratepayers and meet state standards for energy, water and fuel consumption before it can qualify for judicial streamlining — the faster path through environmental review.

Why it matters

Newsom framed the bills as a reaction to federal deregulation. "While the Trump administration moves toward deregulation, communities are left to deal with the consequences — higher electricity demand, grid constraints, water use, and pollution," he said. "With these laws, we are ensuring that Californians remain in the driver's seat — and that those profiting from data centers aren't doing so at our expense."

The signing came days after Newsom issued an executive order meant to speed up work on an AI "kill switch." The seven bills are AB 1577 (reporting), AB 2383 (electricity), AB 2469 and AB 2619 (water), SB 886 (ratepayer protection), SB 887 (environmental review) and SB 1168 (rate structures).