Enhanced geothermal systems (EGS)
Also known as: EGS, enhanced geothermal, engineered geothermal systems, hot dry rock geothermal
Enhanced geothermal systems (EGS) generate electricity from hot rock deep underground by drilling wells, creating fractures, and circulating water through them to bring heat to the surface.
Traditional geothermal needs rare natural hot springs or reservoirs; EGS aims to make geothermal possible in many more places. While geothermal has long been a niche, techniques borrowed from the oil and gas industry are now delivering the first commercial-scale EGS power.
Enhanced geothermal systems (EGS), explained at three levels
At home
The Earth gets hotter the deeper you go. EGS drills kilometres down into hot rock, pumps water through cracks in it, and brings the heated water back up to make electricity.
At work
EGS can provide clean electricity around the clock, unlike solar and wind. That makes it attractive for grids and for large, steady users like data centres.
At home
Workers drill two or more wells deep into hot rock, then use high-pressure water to open small fractures between them. Water pumped down one well heats up as it flows through the cracks and returns through another well to drive a power plant.
At work
Key factors include drilling costs (which have fallen with oil and gas techniques), well flow rates, reservoir temperature, and long-term heat recovery. Closed-loop designs avoid fracturing by circulating fluid through sealed pipes, trading lower induced-seismicity risk for other engineering challenges.
At home
Fracturing rock can trigger small earthquakes, and occasionally larger ones, as in Pohang. In my opinion, careful site selection and real-time seismic monitoring, with clear rules to stop operations, are what will decide public acceptance.
At work
Evaluate projects on demonstrated flow rates and temperatures, thermal decline over time, drilling cost curves, induced seismicity protocols, water use, and power purchase agreements. Geothermal can also supply heat directly for district heating and industry. Supportive permitting and tax credits have been more durable for geothermal than for some other clean technologies in the US.
Real-world examples
At home
Lena studied petroleum engineering in Calgary and worried about her career's future. Learning that geothermal companies were hiring drillers and reservoir engineers showed her how her skills could transfer to clean energy.
At work
Marcus is an energy buyer for a large tech company that wants clean power around the clock for its data centres. His team signed a long-term contract for EGS power, valuing its steady output compared with solar and wind.
How it compares
| feature | Enhanced geothermal systems (EGS) | Conventional geothermal |
|---|---|---|
| Resource | Hot dry rock, engineered reservoir | Natural hot water reservoirs |
| Locations | Potentially widespread | Limited to volcanic or special areas |
| Technology maturity | Early commercial | Mature |
| Seismic risk | Needs careful management | Generally lower |
EGS builds the geothermal reservoir that nature didn't provide.
For analysts
Clean, always-on power is increasingly valuable as data centres and electrification grow. I'd watch EGS cost and performance data from the first commercial plants closely, because they'll decide whether geothermal becomes mainstream.
History & origin
Los Alamos National Laboratory tested 'hot dry rock' geothermal at Fenton Hill, New Mexico, in the 1970s and 1980s, proving the concept but not the economics. Projects in Europe and Australia followed, and a 2017 EGS project in Pohang, South Korea, was linked to a magnitude 5.5 earthquake, a setback for the field. US startup Fervo Energy, founded in 2017, applied horizontal drilling and fracturing techniques from shale oil. Its Project Red pilot in Nevada began delivering power in 2023, and its Cape Station in Utah reached first power and commercial operation from its first 33 MW unit in September 2026, with two more units expected in early 2027. Calgary-based Eavor is pursuing a closed-loop alternative. In my view, EGS is a striking example of fossil fuel expertise being repurposed for clean energy.