California mandates data center transparency on water and power use

California has enacted sweeping legislation designed to lift the veil on data center operations, requiring operators to reveal previously hidden details about their consumption of two critical resources: electricity and water. Governor Gavin Newsom signed seven bills into law that collectively aim to address growing public concerns about how the infrastructure powering artificial intelligence affects power grids and local water supplies.

The transparency push#

For years, data centers have operated largely in darkness—communities hosting these massive facilities had little way of knowing how much electricity or water they actually consumed. The new disclosure rules begin shifting that dynamic. Starting next year, data center operators must begin publishing monthly reports on energy usage, while water consumption details will be required when applying for permits or licenses.

Mark Specht, a senior manager at the Union of Concerned Scientists, called the information gap frustrating. "There's a lot of hype about data centers right now," he observed, "but it doesn't help that we just don't have basic facts about what's happening with them to try to understand how much of a problem they are."

Cost allocation and environmental review#

Beyond transparency, the legislation addresses how data center infrastructure expenses get distributed. Three bills direct California's Public Utilities Commission to establish separate power rates for data centers, preventing them from shifting grid connection costs to ordinary consumers. Another measure requires data center operators to fund infrastructure upgrades needed to serve their facilities, placing the financial burden where it belongs.

The legislation also strengthens environmental oversight by eliminating categorical exemptions from California's Environmental Quality Act, ensuring data centers undergo full environmental review before operating.

The uncertainty around impact#

Determining whether data centers help or harm California's electricity costs remains murky. One scenario outlined by researchers shows that spreading fixed grid maintenance costs across more customers—including massive data centers—could theoretically lower bills. However, large facilities typically connect directly to transmission systems rather than local distribution networks, bypassing this cost-sharing benefit.