| # | Company | Employees |
|---|---|---|
| 1 |
Orano DSorano.group
Provides expertise and solutions to nuclear operators in industrial logistics, specialized maintenance, radiological safety, decommissioning, and waste management. |
2,118 |
| 2 |
TSE, énergie de confiancetse.energy
Expert in photovoltaic and agrivoltaic development, a leading producer of solar energy in France, operating 18 solar power plants, including the second largest in France, and pioneering agricultural canopies globally. |
331 |
| 3 |
THERMODYN LE CREUSOTbakerhughes.com
A French subsidiary specializing in designing, manufacturing, and maintaining compressors and steam turbines for oil and gas production, refining, and energy recovery One of the world's top providers of advanced turbo-machinery technology |
212 |
| 4 | 163 | |
| 5 |
THEVENIN DUCROTthevenin-ducrot.fr
Distribution of petroleum products across France, established in 1929, recognized as a key player in the French petroleum sector. |
150 |
| 6 |
M-PLUS Groupm-plusgroup.com
Design, qualification, and production of complex boiler-making solutions using advanced technologies for energy and aerospace markets worldwide. |
134 |
| 7 |
évole énergiesevole-energies.fr
Provides professional and residential customers with petroleum products, biofuels, electricity, and wood pellets as alternative energy solutions. |
116 |
| 8 |
METAL DEPLOYE RESISTORmdresistor.com
Design manufacture power resistors for energy distribution, production, railway traction, and industry with customized solutions for international clients. |
111 |
| 9 | 90 | |
| 10 |
Opale Energies Engagéesopale-energies.fr
Development and management of wind energy projects with a focus on sustainability, innovation, and strong community and territorial respect. |
73 |
| 11 |
LG HVAC Solutions Francelg.com
Provides sustainable heating, ventilation, and air conditioning systems, actively contributing to energy transition with integrated energy modules for various spaces. |
52 |
| 12 |
SOCIETE DE DISTRIBUTION GAZ ET EAUX
Distributor of gas and water utilities located in Mamirolle, France, providing supply and distribution services to residential and commercial customers |
40 |
| 13 |
Clef Énergiesclef-energies.fr
A growing company specializing in renewable energies since 2008, focusing on solar energy and heat pumps for various buildings, offering tailored services and expertise |
39 |
| 14 |
M.G.O. Lepaul SASmgo.fr
Specializing in manufacturing high-precision mechanical parts for various high-end applications, with CNC machines, welding workshop, R&D department, and international trading services |
38 |
| 15 |
KHIMODkhimod-alcen.com
Develops and sells solutions for producing synthetic molecules like e-methane, e-methanol, and e-fuels, reusing CO2 with decarbonized hydrogen. Actively involved in decarbonization across various industries. |
37 |
| 16 |
Wewise - La Roche-sur-Foronwewise.fr
A European leader in positive decarbonization, specializing in energy performance solutions Offering tailored services for green energy transition projects nationwide |
36 |
| 17 |
Bois du Dauphiné / Groupe BDD - AEBscierie-bdd.com
Processes and enhances wood for construction and packaging. Produces renewable energy, specifically electricity and pellets. |
31 |
| 18 |
MOOVEO Energiesconnectedwind.com
Connected Wind Services is a leading independent service provider for wind turbines in Europe, offering reliable services to operators and owners for over 30 years |
29 |
| 19 |
Thaliethalie.energy
The company offers businesses the opportunity to achieve energy independence through solar power, reducing costs and adapting to electricity price hikes |
23 |
| 20 |
SEEB INDUSTRIE - Usinage de précisiongroupeseeb.com
SEEB INDUSTRIE offers comprehensive support in designing, producing, and machining high-value parts in small to medium series, using cutting-edge technology worldwide |
22 |
| 21 |
PLANETE +planete-plus.fr
Provides photovoltaic solutions for various constraints: self-consumption, virtual storage, physical battery, and total resale. Systems adapt to agricultural, tertiary, industrial, and residential buildings. |
22 |
| 22 | 18 | |
| 23 | 15 | |
| 24 |
MINCATEC Energymincatec-energy.com
The company specializes in developing low-pressure hydrogen storage tanks using metal hydrides for stationary and mobile applications, offering innovative, compact, and efficient solutions |
13 |
| 25 |
Territoire d'énergie Doubs - Sydedsyded.fr
A public establishment managing electricity distribution networks for 563 municipalities, focused on local energy provisions, safety, and environmental initiatives |
12 |
| 26 | 12 | |
| 27 |
CLHYNNclhynn.com
Provides compact 2-in-1 electricity solution for mobile and stationary uses, based on mineral cartridges that convert to fertilizers after use, powering vegetation. |
12 |
| 28 |
CRAI Energies
The company specializes in designing, installing, and maintaining photovoltaic installations for professionals in the industry |
12 |
| 29 |
MAHYTECmahytec.com
Specializing in hydrogen storage systems, this innovative company offers compressed and solid storage solutions, certified for transport and stationary use of hydrogen |
9 |
| 30 |
neriusinvestneriusinvest.com
A sustainable industries company specializing in hydrogen and methane production from biomass, focusing on environmentally-friendly projects in France and internationally |
7 |
| 31 |
Solutions Hydrogènesolutionshydrogene.com
Specializing in green hydrogen storage solutions, we provide tailored services for industrial, municipal, and residential clients |
3 |
| 32 |
SAS SOLAIRE COMTOIS
Specialized installation company for photovoltaic solar panels, serving residential and commercial clients up to 36kWc on traditional roofs, steel roofs, and flat roofs |
2 |
| 33 |
Groupe BDD - AEBbdd-aeb.fr
Industrial sawmill processes softwood, generating electricity and wood pellets from wood by-products. Environmentally responsible, PEFC certified. French company. |
2 |
| 34 |
BER - Brenil Energies Renouvelablesber-fr.com
Manufactures 100,000 tons of high-performance, 100% softwood pellets from local Morvan forests, directly connected to a sawmill, ensuring low carbon footprint. |
n/a |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
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