How much power can EGS really deliver?
Current enhanced geothermal systems (EGS) typically produce 1 megawatt-electric or less of limited duration [1]. That is enough to power a few hundred homes, but not enough to meaningfully displace fossil fuels. A new single-well design called the Deep Geothermal System (DGS) claims to change that dramatically: it projects a peak thermal output of 118 megawatts-thermal (MWt) and a 20-year average of 50 MWt, which translates to about 30 megawatts-electric of continuous power for three months when used as seasonal storage [1]. That is a 30-fold increase over existing hot-dry-rock methods, achieved by using a single vertical well with 15 massive, highly separated fractures in rock above 300°F [1].
However, not all EGS designs perform that well. A study of a coaxial borehole heat exchanger in Australia's Habanero reservoir found that production temperature dropped from 250°C to 100°C within just 10 hours of operation, making continuous electricity generation impractical after that point [2]. That study proposed a cyclic approach—10 hours of energy recovery followed by 110 hours of shutdown—to allow the rock to reheat [2]. This contrast shows that EGS performance depends heavily on the specific design and geology: the DGS design [1] is optimized for sustained output, while simpler closed-loop systems [2] may only work intermittently.
What are the costs and barriers?
Cost is a major factor in whether EGS can have a real climate impact. A 2025 review in Nature Reviews Clean Technology reports that in the United States, enhanced geothermal is expected to achieve a levelized cost of electricity of $80 per megawatt-hour (MWh) and plant capital costs of $4,500 per kilowatt by 2027 [5]. For comparison, that is competitive with current U.S. market electricity prices, which average around $70–$100/MWh. The DGS design claims it can cut total costs to half those of the lowest-cost power sources by eliminating the need for multiple wells and boosting productivity 30-fold [1].
The main barriers are technical and social. Induced seismicity—small earthquakes triggered by fracturing rock—has historically hindered EGS expansion [5]. Advanced drilling techniques like horizontal drilling and multistage stimulation are helping to manage that risk and reduce costs [5]. Life-cycle greenhouse gas emissions from EGS plants are very low: a study of the Rittershoffen plant in France, an operating EGS, found its emissions are comparable to other renewables [4]. So the climate benefit is real if the technology can scale.
How close are we to widespread deployment?
Some EGS plants are already operating commercially in Europe, providing heat and electricity [4][5]. The Rittershoffen plant in France, for example, supplies industrial heat, and a similar plant is planned in Illkirch Graffenstaden [4]. In the U.S., the Department of Energy's goal is to have EGS cost-competitive by 2027 [5]. The DGS design [1] is still at the simulation stage—based on computational fluid dynamics and heat transfer modeling—but its authors claim it could enable 'climate level impact' if built.
Across the studies reviewed here, the evidence points in the same direction: EGS has the technical potential to provide clean, firm (baseload or dispatchable) power at scale, but it is not yet a proven, widespread solution. The largest and most recent review [5] concludes that with further development to manage induced seismicity and increase system flexibility, EGS could play a significant role in clean energy systems. The key unknowns are whether the high-productivity designs [1] can be built reliably in real rock formations, and whether the cyclic limitations of simpler designs [2] can be overcome.
About These Sources
This answer is built on 5 peer-reviewed studies — published from 2018 to 2026, 3 from 2024 or later, 2 in Q1 journals, collectively cited 180 times — selected as the most relevant from 6 studies that passed quality screening, drawn from 83 papers retrieved from a database of over 500 million.
Sources used in this answer
Deep Single Well Hot Dry Rock EGS Method for 30 MWe Power and 60 GWh Seasonal Storage Capacity
A simulation-based single-well EGS design (Deep Geothermal System) claims 30-fold higher power output than current methods, with a 20-year average of 50 MWt and seasonal storage of 30 MWe for three months, at half the cost of the cheapest power sources.
Harnessing the heat below: Efficacy of closed-loop systems in the cooper basin, Australia
A coaxial borehole heat exchanger in Australia's Habanero reservoir showed production temperature dropping from 250°C to 100°C within 10 hours, requiring a cyclic 10-hour-on/110-hour-off recovery cycle for practical energy recovery.
Numerical investigation of the impact of fracture aperture anisotropy on EGS thermal performance
Numerical simulations of fracture aperture anisotropy showed that 70% of fracture distributions gave better thermal performance when flow was perpendicular (rather than parallel) to shear offset, with flow-wetted surface area directly increasing heat extraction.
Life-cycle climate-change impact assessment of enhanced geothermal system plants in the Upper Rhine Valley
Life-cycle assessment of the Rittershoffen EGS plant in France (an operating commercial plant) quantified its greenhouse gas emissions, providing a benchmark for EGS climate impact.
Enhanced geothermal systems for clean firm energy generation
A 2025 review reports that U.S. EGS is expected to reach a levelized cost of electricity of $80/MWh and capital costs of $4,500/kW by 2027, with advanced drilling techniques helping to manage induced seismicity and reduce costs.