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Geothermal energy

Geothermal energy is a renewable energy below the surface of the Earth.

What is geothermal energy?

The word GEOTHERMAL comes from the Greek geo (earth) and thermos (hot). It is therefore a renewable energy stored in the form of heat beneath the surface of the solid Earth.

Geothermal energy comes from the heat released by the decay of radioactive elements naturally present in the earth. Groundwater transports these calories.

Geothermal power plant schema

Geothermal energy is classified according to the enthalpy of the resource, that is to say, according to the energy content of the geothermal water:

A high enthalpy resource or high energy or high temperature (temperature above 160 ° C) and middle enthalpy (temperature between 90 ° C and 160 ° C) can generate electricity by thermoelectric conversion.
Example: Bouillante geothermal power station.

A low enthalpy resource or low energy or low temperature (temperature between 30 ° C and 90 ° C) allows direct use by heat transfer. Example: Paris basin operations based on the geothermal doublet technique that transfer heat to urban heat networks by plate heat exchangers.

A very low enthalpy resource or very low energy or very low temperature (temperature below 30 ° C) requires the use of thermodynamic systems such as heat pumps to multiply calories.
Example: Heating a detached house or building.

Geothermal power plant in Bouillante, Guadeloupe

Geothermal power plant photo

How it works ?

Heat from geothermics

The following videos summarize how heat is distributed over the network, and how electricity is produced:

Electricity from geothermal energy - pic

Géothermie Perspectives puts at your disposal everything you need to know about geothermal energy, especially geothermal heating.

Why choose Geothermal?

An ideal solution for the production of heat and electricity. Indeed, the fight against climate change and the protection of the environment are a major challenge for our future and our development.

In this context, the increasing use of renewable energies, provided for by the energy transition law, places geothermal energy at the center of concerns in terms of achieving the objectives of heat and electricity production. Geothermal energy has a very important development potential; the heat of our earth is everywhere, not very visible, and sometimes difficult to apprehend, but when it is geologically accessible and relevant in terms of energy, it is a source of ecological, renewable and economic energy. This is by far, a local energy, insensitive to climatic hazards and free from the risk of supply disruption. It does not emit greenhouse gases, and does not require transportation or storage.

Photo about geothermics protection of the environment

Geothermal energy helps protect the environment

France has resource guarantee schemes that minimize the financial risk for the project owner. Many local authorities (especially in Ile de France and Aquitaine) and more and more manufacturers rely on geothermal energy. In favorable geographical areas (volcanic areas in particular), the development of geothermal energy for electricity production is booming. A geothermal project is often considered a complex and expensive operation, CFG has the necessary skills and experience to make them simpler and to control their cost.

Photo showing a greenhouse equipped with geothermal networks

Supply of urban heat networks or
of industrial activities


Geothermal energy is a natural mineral resource that allows local production of electricity, heat or cold in accordance with a need expressed on the surface by a network, an installation or an industrial process.

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