Solar Furnaces for Small Industries

Use of solar furnaces and plants for industrial processes exploiting the concentration of the sun's rays, replacing petroleum. Applications include the production of ceramics, metals, hydraulic binders, and the forging of agricultural and industrial tools.

An initiative of Société Four Solaire Developpement

Overview of the project

For the past thirty years, Denis Eudeline has been developing high-temperature industrial processes on the world’s 1st solar furnace, which dates back to 1949 and is still in operation!
The aim: to replace fossil fuels, which are running out, and firewood, which is causing dramatic deforestation, by concentrating the sun’s rays using judiciously placed mirrors, the Solar Furnace or Solar Plant.
The sun’s energy is abundant in southern Europe, and even more so in the southern countries, where the greatest number of human beings live. Solar energy is “free”, “inexhaustible” – because the sun will last for billions of years to come – totally non-polluting, and doesn’t need to be transported, unlike all other fuels.
Four Solaire Développement has been totally self-financing for thirty years! From sales of the products made at the Solar Furnace, ceramics and bronzes, from the scientific events we organize, and from external services such as solar cookers, solar dryers and training courses.


Replace depleting fossil fuels and firewood by concentrating the Sun's rays - free, non-polluting, inexhaustible energy that doesn't need to be transported; possible operation as solar bienergy plus biogas, or solar plus hydrogen.

Level of progress

Ongoing research

Project timeline

01/07/1993 - Project still in progress

Quantitative results
  • Sintering of Sahara Sand in the Solar Furnace at 1550 – 1600°C, to make it compatible with Concrete manufacturing. For a company in Malta.
  • Recycling by Solar Furnace melting at 1600°C of special stainless steel machining chips from
  • the mechanical movements of Swiss Luxury Watches, for a SWISS company.
  • Elaboration of Apatite, for a French company, which installs natural filters, the size of a pond, planted with reeds, to purify sewage water, and make it clean for watering plants.
  • Project: Production of “GREEN” hydrogen, using a solar furnace, with no pollution or CO2 emissions.
  • Project with a team of Airbus Aérospatial engineers for solar furnaces on the Moon.
  • Project to set up Solar Furnaces in Morocco and Madeira.
Qualitative results

By operating on a totally self-financing basis, we have been proving for thirty years that operating a solar furnace is profitable!
Not only does Four Solaire Développement live from the sale of its Solar Furnace production and external activities, without any financial aid of any kind, but it also carries out scientific research, pays its employees and pays rent to the Municipality of Mont-Louis, plus all social security contributions, ancillary costs and taxes!
Numerous companies around the world call on its skills and unique expertise.


Total self-financing, from the sale of our products at the Solar Furnace, our Scientific Events, over 30,000 paying visitors per year, and our external activities!

About the

Société Four Solaire Developpement

Denis Eudeline
Research Engineer, Director, Managing Director.

Development of Industrial Processes, using the Concentration of the Sun’s Rays, as a source of energy at high temperatures, as a replacement for Oil, for all operations of Firing, Forging and Melting of all metals.
A Solar Furnace or Solar Plant is a source of high-temperature energy, above 3,000°C, for ceramics, bricks, tiles, sanitaryware and tableware. Firing of hydraulic binders, cement, lime, laterite, plaster… Melting of all metals, ferrous and non-ferrous, between 200 and 2000°C. Forging of agricultural and industrial tools. Baking, precious stone production, etc.

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A project
in collaboration
  • Conseil Départemental

    University of Perpignan Optics Laboratory

  • C.N.R.S.

    WECF Foundation

Other partners / supporters

Laboratoire d’Optique de l’université de Perpignan.
Conseil Départemental des Pyrénées Orientales.
Luc DANDO, aide technique.
Crédit Impôt Recherche.
WECF Foundation