California spent the past year building a legal answer to a single question: when an AI warehouse plugs into the grid, do its owners pay for the power, or do your household bills? Sacramento passed bills, opened a rate case and teed up a November ballot measure — well ahead of the campaign-trail panic now spreading elsewhere.

This month a leaked Republican campaign memo turned data centers into a national story, warning that voter anger could sink a U.S. Senate candidate in Ohio. California didn't need the memo. Its legislators and residents have spent months fighting over who pays for the power these warehouses draw — and the state's answer is already further along than any campaign ad.

Here is where that fight actually stands.

Start with the electricity bill. That is what California's data-center fight has always been about, and it is why the state was writing rules long before the subject reached a campaign ad.

The scale explains the urgency. Pacific Gas & Electric has warned regulators that AI projects lining up for power could draw roughly 10 gigawatts of new demand over the next decade — about four times the capacity of the Diablo Canyon nuclear plant, CalMatters reported (external source, opens in a new tab). In March, the state's independent Little Hoover Commission warned that AI could spike household bills unless the industry pays its own way. Grid costs from the centers, said commission chair Pedro Nava, should fall on the companies, not on families "already struggling with high utility bills."

Sacramento moved on it. State Sen. Steve Padilla's SB 886 and SB 887 — which would force the California Public Utilities Commission to set a special tariff so data centers cover their own transmission costs — cleared the Senate in May (external source, opens in a new tab), 27-8 and 29-9. Californians, Padilla said, "cannot be the collateral" for companies chasing "record-breaking profits." Assemblymember Cottie Petrie-Norris, who chairs the Assembly's energy committee, said the Legislature was "moving expeditiously" to "protect Californians from any rate increases." The ratepayer group TURN and the environmental group Net-Zero California co-sponsored Padilla's package.

Grid costs from the centers, said commission chair Pedro Nava, should fall on the companies, not on families "already struggling with high utility bills."

The national alarm arrived later, and it was about votes rather than tariffs. This week the National Republican Senatorial Committee circulated a memo — first reported by Axios (external source, opens in a new tab) and confirmed by the Washington Post (external source, opens in a new tab) — warning that the warehouses had become "the anchor hanging around" Ohio Sen. Jon Husted's neck, with Democrat Sherrod Brown branding him "the face of data centers." President Trump, meanwhile, told a White House crypto event he'd "absolutely want" a data center as a mayor or governor because the jobs and taxes were "enormous," the Associated Press reported (external source, opens in a new tab). James Henson, who directs the University of Texas at Austin's nonpartisan Texas Politics Project, told the AP the White House looked "tone deaf at best."

That out-of-state alarm is only now catching up to a link California legislators drew months ago. Padilla's own May announcement (external source, opens in a new tab) pitched the state bills against a national backdrop, citing Ohio's energy regulators, the new governors of Virginia and New Jersey vowing to force the industry to cover its own costs, and "even President Trump" conceding companies should shoulder theirs. California was already legislating against the same dynamic the GOP memo now treats as a fresh threat.

The East Bay carries its own test into November. Solano County voters decide Measure E, a business-license tax The Dissent reported would apply to data centers whether or not a single server is switched on. Nearby cities have spent the summer fighting the same campuses: more than 300 residents packed a Pittsburg City Council meeting in June to oppose a data center approved without their knowledge.

The lesson the out-of-state strategists are only now absorbing is one California has been working through as a rate case, not a slogan. The anger isn't really about artificial intelligence in the abstract. It's about a utility bill — and this state started doing the math first.