The race to build artificial-intelligence systems is becoming a race
to find electricity. Google’s latest answer lies several kilometres
beneath the Utah desert.
On 1 September 2026, Fervo Energy announced a power purchase
agreement under which Google will buy 396 megawatts from an expanded
version of Fervo’s Cape Station geothermal project. The companies
describe it as the largest enhanced-geothermal power agreement announced
to date. The contracted capacity is expected to come online in 2028 and
is intended to support a possible Google data centre in Utah. Fervo’s
announcement also gives Google an option to add about 600 megawatts by
June 2030, potentially taking the total close to one gigawatt.
That is a substantial commitment to a technology that borrows heavily
from the oil and gas industry—except that the valuable resource is heat,
not fuel.
The agreement is important, but it is not the same as a working
396-megawatt power plant. The new capacity still has to be built,
connected and operated successfully. Google’s Utah data-centre plans
also remain conditional on engineering work, government approvals and
commercial circumstances.
Why AI companies
are searching for firm power
Large data centres need electricity every hour, including when the
sun is down and the wind is weak. Batteries can shift renewable
electricity across part of a day, but providing continuous power at
data-centre scale remains a demanding engineering and grid
challenge.
The International Energy Agency says a typical AI-focused data centre
can use as much electricity as 100,000 households. The largest
facilities under construction could consume about 20 times that amount.
Globally, the agency expects data-centre electricity consumption to more
than double from 415 terawatt-hours in 2024 to roughly 945
terawatt-hours in 2030, although the forecast remains sensitive to
AI adoption and improvements in computing efficiency.
That explains the attraction of geothermal energy. Unlike solar and
wind, a geothermal plant can normally produce power around the clock.
Unlike a gas-fired plant, it does not have to burn a fossil fuel to
generate electricity.
Conventional geothermal plants, however, require an unusually
convenient combination of underground heat, permeable rock and naturally
available fluid. Those sites are limited.
Enhanced geothermal systems, or EGS, try to loosen that geographical
restriction.
How enhanced geothermal systems turn hot rock into power
An EGS project drills into hot rock and creates or improves
underground pathways through which water can circulate. Cooler water
travels down an injection well, absorbs heat from the rock and returns
through a production well. At the surface, that heat is converted into
electricity before the water is sent underground again.
Fervo combines this basic idea with horizontal drilling, multi-stage
well stimulation and fibre-optic sensing—techniques adapted from shale
oil and gas development. Horizontal wells expose a longer section of hot
rock than a simple vertical well, while fibre-optic cables help
operators observe temperature, strain and acoustic activity below
ground.
This is not merely a laboratory concept. Fervo’s smaller Project Red
in Nevada began supplying electricity to the grid in 2023. A July 2026
Congressional
Research Service report described it as the only operational EGS
plant in the United States at that time and put its output at 3.5
megawatts. The same report stressed that commercial-scale EGS viability
remains uncertain.
Cape Station is the much larger test. Fervo says its first phase is
designed to provide about 100 megawatts, followed by a broader build-out
targeted for 2028. The new Google contract would support that expansion
rather than simply purchase electricity from a plant already in
service.
Why a
power contract matters before the power exists
A power purchase agreement, or PPA, is a long-term contract to buy
electricity under defined terms. It gives the developer a committed
customer and a future revenue stream, which can make it easier to
finance construction.
For Google, the agreement offers the prospect of new, continuous
low-carbon electricity near a future computing site. For Fervo, it
provides a large buyer willing to support a technology that is still
moving from pilot scale to utility scale.
The two companies already have a history. Project Red was developed
with Google, and in 2024 Fervo signed a separate 115-megawatt agreement
involving Google and Nevada utility NV Energy. The new Utah deal is more
than three times larger.
It also shows how AI demand may accelerate technologies that had
previously struggled to find customers prepared to pay for early
projects. The IEA expects renewables to provide about half of the global
growth in data-centre electricity demand through 2035, while geothermal
and nuclear could contribute firm, low-carbon generation.
What still has to be proved
EGS has genuine potential, but “hot rock” does not automatically mean
cheap or reliable electricity.
Deep geothermal wells are expensive. The US Department of Energy says
drilling can account for 50% or more of a
geothermal project’s capital cost. Hard, hot rock is difficult on
equipment, and the economics depend on maintaining enough underground
flow and temperature over many years.
Reservoir stimulation can also trigger small earthquakes, so projects
need seismic monitoring and operating rules that allow activity to be
reduced or stopped if necessary. Water use, well integrity, transmission
access and the time required for permits are additional local
concerns.
Most importantly, Fervo must demonstrate that Cape Station’s many
wells and modular generating units can achieve dependable net output at
the promised scale. Company forecasts describe targets, not measured
future performance. Independent industry commentary has also called for
more
complete long-duration well-test data from Cape Station, a reminder
that contracts and construction milestones do not settle questions about
reservoir behaviour.
There is also a distinction between 396 megawatts of generating
capacity and 396 megawatts delivered continuously without interruption.
Maintenance, pumping loads and operational conditions affect the net
electricity available to a customer.
A pivotal test
for next-generation geothermal
Google’s agreement does not prove that enhanced geothermal is ready
to power every data centre. It does show that a major electricity buyer
is prepared to anchor a project far larger than the current US
demonstration.
If Cape Station reaches its 2028 targets, it would strengthen the
case that techniques developed to extract oil and gas can be redirected
toward a different resource: the Earth’s stored heat. It could also give
grids another source of low-carbon power that operates when
weather-dependent generation is unavailable.
If drilling costs, reservoir performance or construction schedules
disappoint, the deal will instead expose the gap between a promising
pilot and a repeatable power industry.
That makes Cape Station more than a source of electricity for Google.
It is becoming a public test of whether enhanced geothermal can graduate
from an ingenious engineering demonstration to infrastructure built by
the hundreds of megawatts.
Reporting note
The 396-megawatt agreement and possible 600-megawatt expansion were
announced by Fervo Energy on 1 September 2026. The associated generating
capacity is targeted for 2028 and is not currently operating. Expansion
and Google’s possible Utah data centre remain subject to stated
conditions. Output, cost and timing claims relating to future
construction should therefore be treated as forward-looking company
targets.
Another proposed source of continuous power is small nuclear generation: our NuScale–Oklo comparison explains the reactor designs and remaining milestones.
Sources and further reading
- Fervo
Energy and Google: 396 MW power purchase agreement - Reuters:
Fervo signs geothermal power-supply deal with Google - International
Energy Agency: Energy and AI executive summary - US Department
of Energy: Utah FORGE enhanced-geothermal programme - Congressional
Research Service: Enhanced Geothermal Systems Commercialization - Cape Station project
information - GeoExpro
commentary on reservoir-performance data
FutureTechDose covers biotechnology, AI, data-centre and
energy-sector research and industry progress for a general audience.
This article is informational and does not provide medical or investment
advice.
Leave a Reply