Geothermal energy company Fervo notched another win as Google agreed to buy nearly half a gigawatt of electricity to power a planned new data center in Utah.

The power purchase agreement, announced Tuesday, commits Google to buying 396 megawatts from Fervo’s Cape Station power plant in Utah, which is expected to come online in 2028. Google has the option through June 2030 to buy an additional 600 megawatts.

The deal arrives as Google and other hyperscalers are scouring the country for new sources of electricity. For years, Google has been one of the larger purchasers of clean energy in the U.S. and elsewhere, buying electricity from wind, solar, and batteries to make good on its promise to reach net-zero emissions by 2030.

But in April, that goal became harder to reach after Google inked a deal with data center developer Crusoe for 933 megawatts of natural gas power in Texas.

The Fervo deal could help Google fuel its AI ambitions without significantly imperiling its net-zero goal.