Closed-Loop Geothermal Technology for a 24/7 Carbon-free future

Eavor’s closed-loop geothermal technology consists of several Patent Pending innovations. The Eavor-Loop is a closed-loop geothermal system within which a proprietary working fluid is contained and circulated. The working fluid is not fluid from a reservoir flowing into our wells, it is a fluid added to the closed-loop Eavor-Loop™ to create an efficient radiator, much like a vehicle radiator circulates fluid in a closed loop to remove heat from a gasoline engine.


Eavor-Loop™ harvests heat from deep in the earth to be used for commercial heating applications (ex: greenhouses or district heating) or to be used to generate electricity using conventional heat to power engines. Eavor-Loop™ is an industrial scale geothermal system that mitigates many of the issues with traditional geothermal systems, which rely upon using wells to produce brine from a subsurface aquifer.


The closed-loop is the key difference between Eavor-Loop™ and all traditional industrial-scale geothermal systems. Eavor-Loop™ is a buried-pipe system, which acts as a radiator or heat exchanger. It consists of connecting two vertical wells several kilometres deep with many horizontal multilateral wellbores several kilometers long. As these wellbores are sealed, a benign, environmentally friendly, working fluid is added to the closed-loop as a circulating fluid. This working fluid is contained within the system and isolated from the earth in the Eavor-Loop™. The wellbores act like pipes, not wells producing fluid from the earth.


The working fluid naturally circulates without requiring an external pump due to the thermosiphon effect of a hot fluid rising in the outlet well and a cool fluid falling in the inlet well. The working fluid contained in this closed-loop pipe system brings thermal energy to the surface where it is harvested for use in a commercial direct heat application or converted to electricity with a power generation module (heat engine). Unlike heat pumps (or “geo-exchange”), which convert electricity to heat using very shallow wells, Eavor-Loop generates industrial-scale electricity or produces enough heat for the equivalent of 16,000 homes with a single installation.

How Does Geothermal Energy Work?

Geothermal Energy works via a process by which drilled wells extract heat from deep underground to be brought to the surface where it is transformed into electricity. Where traditional geothermal was not feasible, the industry has been transformed by new technologies such as closed-loop geothermal technology.

The Key Elements of an Eavor-Loop™

An Eavor-Loop™ is the connection of two vertical wells with many horizontal multilateral wellbores creating a closed sealed radiator-like system. Eavor’s proprietary working fluid is not from a reservoir, it is selected and added at surface, then circulated to harvest heat from deep in the Earth to be used to generate electricity or in commercial heating/cooling applications.

Spread Section

A series of lateral legs stemming out from the vertical and cased well section after the 90° turn. Precise multilateral drilling is designed to specific subsurface profiles to maximize efficiency.

Multilateral / Rock-Pipe™

The profiled multilateral sections are completely separated from the rock and each other using Eavor’s protective Rock-Pipe™ completion technology. Working fluids are permanently isolated and contained within the system.


Magnetic Ranging Technology, a borrowing from the energy services sector, provides the basis to make these, at depth intersections consistent, efficient and safe.

Benign Footprint

The world’s most benign environmental impact & surface footprint. Eavor can fit in a backyard, repurpose inactive well sites or decommissioned industrial/commercial facilities. The facility has no emissions of any kind during operations.

Thermosiphon Effect

The closed-loop system in an Eavor-Loop™ allows the fluid to circulate without a parasitic load, providing global scalability.

Resilience & Sustainability

The Eavor-Loop™ system requires no connection to the outside world and operates without fuel and is completely emission-free. The fully-independent system can be placed in a bunker or buried below surface to be made resilient to natural disasters.

What is Closed-Loop Geothermal?

Closed-loop geothermal is an encapsulated system within which a proprietary working fluid is contained and circulated to harvest heat from deep in the earth to be used for commercial heating applications (ex: greenhouses or district heating) or to be used to generate electricity using conventional heat to power engines.

How Eavor Works

– The ability to drill and intersect a multilateral Eavor-Loop™ with 2 laterals

– The ability to simultaneously drill and seal the wellbores, creating a closed-loop that is isolated from the surrounding formation and will neither leak fluid out of the Eavor-Loop™ nor allow formation fluids to ingress into the Eavor-Loop™.

– Prove the thermodynamic performance of the Eavor-Loop™ – that the subsurface heat transfer and thermosiphon effect match expectations.


Economic, clean, reliable power. – Energy never stops.


Eavor-Loop™ can be implemented almost anywhere at scale. Our sites can exist close to urban centres or in remote locations where getting electrical power is historically challenging.

Eavor's Circle of Knowledge

Learn about how Eavor’s Circle of Knowledge and the province of Alberta, Canada can help build an Eavor-Loop anywhere in the world!

The Thermodynamics

of Eavor-Loop™

Go deep underground and see the heat extraction profiles of the rock when an Eavor-Loop™ passes by. Watch our new video on Eavor-Loop™ Thermodynamics.

Ranging &


The video below is a showcase of the ranging and intersection process of our multilateral drilling technology.

The World's

Cooling Challenges

The World’s Environmental Cooling Challenges & How Eavor Can Help

The World's

Geothermal Potential

A showcase of the potential for geothermal power as a globally scalable resource.

See our Eavor-Lite Demonstration Facility

The Derek Riddell Eavor-Lite™ Demonstration Facility is a full-scale prototype of the Eavor technology suite. The facility site is located near Rocky Mountain House, Alberta.

Get In The Loop