One way to energy sovereignty

No fracturing

As opposed to current deep geothermal technologies such as enhanced geothermal systems (EGS), EAPOSYS involves no hydraulic fracturing.
Instead, it controls and optimizes the use of heat tapped from the earth’s crust by means of micro-tunnels equipped with coaxial pipe elements (patent pending).


EAPOSYS relies on closed loop coax circulation of a heat transfer fluid into grids of μ-tunnels deployed at heat depth. Flow rates of the heat transfer fluid can be monitored for optimized system capacity.

Endless use

EAPOSYS deployment at heat depth can be extended incrementally. The system lifetime is prolonged by limited heat extraction. At the end of one operation cycle, EAPOSYS micro-tunnels can be put off for heat recovery and then easily drilled again for a new operation cycle.


Environmental and social sustainability indicators are comprehensively evaluated and incorporated at the very inception of EAPOSYS proposal.

To mitigate climate change, most developed countries have adopted a ‘much-commented’ energy transition, aiming at implementing the Kyoto Protocol and Paris Agreement, electrifying the world but losing the battle of reducing greenhouse gases (GHG) emissions. In 2020, new renewable still accounted for less than 5% of the total share of global energy with average GHG emission rate of 1000 tons per second.

Mainstream energy policies define energy security as the uninterrupted availability of energy sources at an affordable price. Concepts of rational use of energy are preferentially marginalized, and renewable energy often assimilated to sustainability without justification.


µ-tunnel coax heat exchange technology

EAPOSYS is based on series of µ-tunnels pierced to a depth of about 5 km in the hot (>150° C) granitic basement. EAPOSYS coax heat exchange pipes are deployed in the µ-tunnel excavation. The internal structure of the heat exchange pipe element enables optimized heat extraction. Geothermal may represent the new gold frontier. All we need to do is to start digging.


Conventional geothermal resources (highly permeable aquifer at volcanic-like temperature) are limited to geographic niches. Hence hot dry basement rocks represent the largest potential and must be targeted for local power generation and district heating.

Current technologies for hot dry rock systems involve hydraulic fracturing to form and propagate fractures with the aim of creating an artificial reservoir to circulate hot fluids at depth, posing the risk of induced seismicity.

Due to the extremely low permeability of artificial reservoirs, combined to uncontrolled flow paths, such enhanced geothermal systems (EGS) have not proven at date the capability of creating a 5 MWel plant.

Geothermal is the greatest source of renewable energy; and yet, it is the least exploited. Why are we waiting?

99% of the Earth’s mass is hotter than 1000°C, only the three first kilometers are cooler than 100°C. EAPOSYS intends to find and provide the means to develop a deep geothermal system, capable of optimized heat extraction for local electricity and heat generation over a long period of time (+50 years).