Google is transforming advanced geothermal from an energy experiment into a concrete part of its strategy to power data centers. On August 26, Fervo Energy filed a power purchase agreement with the SEC between its subsidiary Cape Generating Station 6 and Google Energy for 396 megawatts generated by advanced geothermal systems at Cape Station in Beaver County, Utah.
The PPA has a 15-year term and includes four successive 99 MW tranches, with commercial operation slated to begin in the third quarter of 2028. Fervo has also agreed to offer Google an expansion option of approximately 600 MW, with the potential goal of bringing total contracted capacity to at least around 950 MW by June 2030, provided the parties reach a definitive agreement on the extension.
Advanced geothermal uses techniques developed by oil & gas
Traditional geothermal is limited to areas where subsurface heat, water, and permeability are naturally favorable. Fervo uses horizontal drilling and techniques derived from shale to create systems where fluid can circulate through hot rock even in less ideal locations.
The goal is to turn a widespread geological resource into a dispatchable source of electricity. It does not depend on the sun or the wind and can generate power relatively continuously.
For data centers, continuity is extremely valuable
Solar and wind are cheap but intermittent. Data centers run 24/7 and require predictable power. Batteries and the grid can offset part of the variability, but a clean source capable of continuous generation holds particular value.
This is why big tech companies are signing agreements for nuclear, geothermal, and other forms of firm power. The AI boom makes the issue even more urgent, as new clusters require hundreds of megawatts.
396 MW won't arrive tomorrow
The first block is expected starting in 2028, and the project remains subject to permitting and development. This is important because energy announcements can give the impression that new capacity is immediately available.
Constructing wells, plants, and grid connections takes years. Google is therefore procuring energy for future needs, seeking to align data center growth with new generation.
The agreement reduces risk for Fervo
A long-term PPA with a creditworthy customer offers revenue predictability and can facilitate project financing. For emerging energy technologies, having a buyer willing to commit prior to construction is critical.
Google is not just buying electricity: it is helping create demand that can make new geothermal plants bankable.
Utah is experimenting with more flexible pathways
The SEC filing indicates that the project intends to use mechanisms provided under Utah legislation to serve data center loads through configurations that may include front-of-meter or behind-the-meter connections, subject to feasibility and approvals.
This reflects a nationwide American issue: grid connection times are often long, while tech companies want capacity within a few years. Private or dedicated solutions can accelerate certain paths, but they must be coordinated with the electrical grid.
Geothermal competes with nuclear for the same role
Both offer low-emission, baseload power. Nuclear has an extremely high energy density but faces significant permitting processes and upfront costs. Advanced geothermal can be built in smaller modules and leverages drilling expertise already widespread across the United States.
One technology will not necessarily win over the other. AI demand is large enough to support a mix of sources, especially if the grid and permitting remain bottlenecks.
The real cost will emerge with scale
Fervo has demonstrated technical progress, but scaling to hundreds of megawatts is the true economic test. To compete, it must drill faster, reduce costs per well, and maintain thermal performance over time.
Experience from oil & gas suggests that learning curves and standardization can rapidly drive down drilling costs. Geology, however, introduces variability that software cannot eliminate.
AI is changing the geography of energy
For decades, data centers were primarily sited where there was fiber, cheap land, and tax incentives. Now, power availability is becoming one of the dominant criteria. Projects like Cape Station can attract loads precisely because they offer new capacity.
This creates a new relationship between tech companies and local regions: an AI cluster can become large enough to justify building a dedicated power plant.
Google buys time as well as electricity
Signing today for energy that will arrive starting in 2028 allows Google to plan future infrastructure and chart a path toward low-emission sources. For Fervo, it means having a customer that shares the development risk.
The most significant figure is therefore not just 396 MW. It is the fact that advanced geothermal energy is entering the power purchase agreements of AI companies on a scale comparable to major conventional plants. If the tranches come online on schedule, Cape Station will be a decisive test of the ability to turn drilling and underground heat into new digital infrastructure.
