How Geothermal Can Help Unlock 100% Clean Power

The world is chasing something big — a power grid that runs entirely on clean energy. Solar and wind are leading the charge. But here's the catch: the sun doesn't always shine, and the wind doesn't always blow.

That's where firm, always-available power sources come in. Geothermal energy is one of the most promising options on the table right now. It works around the clock, in any weather, silently pulling heat from the earth beneath us.

For over a century, geothermal has played a small but steady role in energy systems. Today, new technology is changing the rules completely. Understanding how geothermal can help unlock 100% clean power is no longer just a scientist's question — it's a policy, investment, and community question too.

The Promise of Next-Generation Geothermal

Conventional geothermal has always had one big limitation: location. It only works where hot water reservoirs naturally exist underground. That's why countries like Iceland and Kenya lead in geothermal capacity, while most of the world sits on untapped potential.

Next-generation geothermal changes that entirely. It doesn't need a natural reservoir. All it needs is the earth's heat — which exists nearly everywhere. That shift in requirement opens up enormous possibilities for regions previously locked out of geothermal energy.

In the United States alone, capacity could grow from 4 gigawatts today to 90 gigawatts by 2050. The Department of Energy's high-end projections push that figure to 300 gigawatts. That's roughly a quarter of the country's total electricity capacity today. The technology isn't theoretical anymore — projects are already running, and major companies are signing geothermal energy deals right now.

How Do Next-Generation Geothermal Technologies Work?

Several new approaches are reshaping what geothermal can do. Three types stand out, each at a different stage of development. Together, they represent a significant leap forward from anything seen before.

Enhanced Geothermal Systems (EGS)

Enhanced Geothermal Systems are currently the most advanced of the next-generation options. EGS works by drilling into hot rock deep underground and creating an artificial reservoir where none existed before. Engineers use hydraulic fracturing and related techniques to crack open the rock. Water is then injected down one well, heated as it circulates through those cracks, and pumped back up through a separate well to generate electricity.

The U.S. Department of Energy has funded several demonstration projects using EGS, including the FORGE project in Utah. That project has been central in refining and testing the latest advances. Fervo Energy already has one commercial EGS project operating in Nevada and another underway in Utah. Several European countries, including France and Germany, also have EGS variants running today.

Closed-Loop Geothermal Systems

Closed-loop geothermal systems work differently from EGS, and the distinction matters. Instead of letting fluids move freely through cracked rock, these systems use sealed wells. Water or another fluid travels through a closed circuit without ever touching the surrounding rock. This design typically eliminates the need for fracking altogether.

The technology is slightly behind EGS in development. However, the company Eavor is already operating a demonstration project in Canada. Its first commercial project is currently in development in Germany. Costs are higher than EGS for now, but the technology continues to improve and the environmental risk profile is notably cleaner.

Superhot Geothermal Systems

Superhot geothermal is the most futuristic of the three — and potentially the most powerful. These systems would access rock temperatures beyond 374 degrees Celsius, the so-called supercritical threshold. At that point, water holds dramatically more energy per unit of mass. That translates into much higher power output per well drilled.

Getting there requires drilling to extreme depths and handling conditions that push current technology to its limits. Companies like Quaise Energy and GA Drilling are pioneering the tools needed to make this possible. If superhot geothermal scales successfully, tapping even a fraction of that energy could theoretically meet all global electricity demand. That's not a small statement.

What Are the Environmental Benefits of Geothermal?

Geothermal energy produces extremely low lifecycle greenhouse gas emissions. Independent analyses consistently place it on par with solar and wind in this regard. It won't replace those cheaper renewables, but it complements them as a firm, low-carbon option.

Unlike coal or gas plants, geothermal facilities emit minimal conventional air pollutants. There's no significant particulate matter, sulfur dioxide, or nitrogen oxide coming out of a geothermal plant. Communities living near these facilities avoid the respiratory and cardiovascular health risks long associated with fossil fuel plants.

Water use is another win. Geothermal uses less water than coal, nuclear, hydropower, or biomass energy. Many systems can also run on non-freshwater sources, like treated wastewater. On top of that, geothermal demands fewer critical minerals like lithium and zinc than batteries or other clean technologies.

Land use is also impressively compact. Conventional geothermal already ranks second only to nuclear for small land footprint. Next-generation systems are expected to be even more efficient in this respect. That matters in regions where land availability is a constraint.

What Are the Potential Risks?

Fracking has earned a bad reputation, largely from its use in oil and gas extraction. EGS also uses fracking, so comparisons are inevitable. But the mechanics and risks are genuinely different.

In oil and gas production, the big seismic problem isn't the fracking itself. It's the massive volumes of wastewater injected underground for disposal. In the Permian Basin, nearly 95% of human-caused seismic activity traces back to wastewater disposal, not fracking directly. Geothermal systems keep water circulating in a closed system and produce far less wastewater. That removes the primary driver of induced earthquakes.

That said, the risk isn't zero. Earthquakes linked to EGS projects have occurred in France, Switzerland, and South Korea — particularly near natural faults or in poorly mapped areas. These incidents highlight why thorough site evaluation is non-negotiable. In the U.S., federally funded EGS projects must follow the Department of Energy's Induced Seismicity Protocol, which includes risk assessment, seismic monitoring, and clear rules for halting activity. It has successfully prevented earthquake incidents for over a decade.

On water contamination, geothermal fracking fluids use little to no chemical additives, unlike oil and gas fracking. Wells are carefully sealed in zones where they pass through aquifers. No cases of groundwater contamination from geothermal operations have been recorded to date.

Is Next-Generation Geothermal Affordable?

Costs have already dropped fast, and there's more room to fall. At the DOE's FORGE site in Utah, drilling rates improved 500% between 2017 and 2022. Fervo Energy cut its drilling cost from $1,000 per foot on its first project to $400 per foot on its second. That kind of progress in just a few years is significant.

Current modeling estimates that optimally placed EGS projects would cost around $64 per megawatt-hour. That puts it competitive with solar paired with battery storage. Closed-loop systems remain more expensive for now, but costs are trending downward as experience accumulates.

Regional geology plays a big role in pricing. Western U.S. states are expected to see the lowest costs, but promising areas exist across many eastern states too. Companies are already signing commercial deals. Google, Meta, and Southern California Edison have all committed to purchasing next-generation geothermal power. That market signal matters.

What's Needed to Scale Up Geothermal Power?

Scaling next-generation geothermal requires action on multiple fronts simultaneously. Three areas are especially critical and deserve serious attention from policymakers and industry leaders.

More Government Funding

Government investment in geothermal has lagged far behind other clean energy technologies. Funding has reached only millions of dollars, compared to the billions directed toward solar and wind. That gap needs to close. Federal investment in research, drilling demonstrations, and underground resource mapping will accelerate cost reductions and attract private capital.

High upfront drilling costs and elevated interest rates currently discourage early-stage projects. Loan guarantees, cost-sharing programs, and drilling risk insurance can help bridge that gap. History supports this approach — government support helped launch the conventional geothermal industry in the 1970s and 1980s.

Faster Permitting

Permitting timelines for geothermal projects on federal lands are often long and unpredictable. A single project may trigger up to six separate environmental review processes. That's both slow and expensive. Increasing funding for agencies like the Bureau of Land Management and centralizing permitting across overlapping jurisdictions would help considerably.

The Biden administration proposed a categorical exclusion allowing exploratory drilling to skip some review steps. Expanding such exclusions, where environmental data supports doing so, could meaningfully cut timelines without sacrificing environmental oversight.

Guardrails to Minimize Risks

Proactive risk management is essential as this industry scales. The DOE's Induced Seismicity Protocol should become mandatory for all projects, not just federally funded ones. Public disclosure of any chemical additives used in fracking fluids should also be required. Existing voluntary databases from the fossil fuel industry could expand to include geothermal operations. That transparency builds public trust.

Completing the Clean Energy Puzzle

A fully clean energy grid needs more than solar and wind. It needs firm, dispatchable power that fills gaps when renewables fall short. Geothermal fits that role well. Beyond electricity, geothermal heat can decarbonize buildings and industrial processes — sectors that are notoriously difficult to clean up.

Conclusion

Next-generation geothermal isn't a far-off dream. It's already working. The cost curves are moving in the right direction. Commercial deals are being signed. Understanding how geothermal can help unlock 100% clean power means recognizing it as a practical, near-term piece of the puzzle — not just a future possibility.

The urgency of climate change doesn't allow for slow timelines. Every year of faster development means more clean power delivered sooner. The heat has always been there beneath our feet. The question now is whether we act quickly enough to use it.