The companies listed in the Rhône department are primarily engaged in the energy sector, ranging from manufacturing and engineering to power generation and environmental services. They include both established mid-sized firms and large groups. Notable companies are Sicame Group, a world leader in electrical energy transmission and distribution accessories, and Reel, which designs complex lifting and handling systems for industries like nuclear and energy. CNR (Compagnie Nationale du Rhône) is a major producer of renewable electricity.
A common pattern among these companies is their focus on sustainable energy solutions and infrastructure. Symbio designs and mass-produces hydrogen-electric fuel cell systems, while EDF solutions solaires offers turnkey solar solutions. Groupe MAÏA supports sustainable territorial development through infrastructure and renewable energy projects. This highlights a regional emphasis on diverse energy production and related services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Sicame Groupsicame-group.com
World leader in production, sales of accessories and services for electrical energy transmission and distribution, safety equipment, and industrial applications. |
1,999 | |||
| 2 |
Reelreelinternational.com
Designs, produces, and maintains complex lifting and handling systems and solutions for highly technical installations in diverse markets like aerospace, nuclear, and energy. |
1,882 | |||
| 3 |
CNR (Compagnie Nationale du Rhône)tm.fr
French leading producer of 100% renewable electricity, managing the Rhône river for hydroelectricity, navigation, irrigation, and agricultural use, supporting local development and innovation |
1,256 | |||
| 4 |
EDF solutions solairesedf-solutions-solaires.com
Offers turnkey solar solutions for individuals, professionals, and communities, supporting energy transition and enabling self-production of sustainable, local, and decarbonized energy. |
1,132 | |||
| 5 |
Symbiosymbio.one
Designing and mass-producing high-performance StackPack hydrogen-electric fuel cell systems for mobility and stationary applications through specialized Gigafactory facilities in Europe and North America. |
539 | |||
| 6 |
Groupe MAÏAgroupe-maia.com
Diverse expertise supporting sustainable territorial development through infrastructure, renewable energy, heritage, biodiversity, and economic and tourism growth projects. |
377 | |||
| 7 |
CLIMAWATTclimawatt.com
It specializes in photovoltaic energy and energy savings, offering expert guidance and support for solar energy projects and installations. |
341 | |||
| 8 |
Ineo Nuclearequans.fr
Support for nuclear industry players with multi-technical solutions covering new builds, retrofits, maintenance, operation, and decommissioning services. |
330 | |||
| 9 |
FOSELEV AGINTISfoselev.com
Specializes in piping projects for oil and gas, chemical, nuclear, power, and pharmaceutical industries, providing industrial piping solutions. |
298 | |||
| 10 |
Chloridechloride.com
Designing, manufacturing, servicing industrial UPS systems securing critical equipment power supply across industries worldwide. Safeguarding people and assets through innovative solutions. |
282 | |||
| 11 |
JST transformateursjst-transformers.com
Design, manufacture, and maintain electric transformers for clients across five continents, with a focus on innovation and sustainable development. |
256 | |||
| 12 |
ACMacm-acr.fr
Design and manufacture of pressure equipment for nuclear, pharmaceutical, chemical, petrochemical, and renewable energy sectors with 75 years expertise. |
219 | |||
| 13 | 196 | ||||
| 14 |
UPERGYupergy.com
Manufacturing and distribution of high-quality batteries, chargers, and portable lighting solutions for industrial, professional, and retail markets through various specialized global subsidiaries. |
191 | |||
| 15 | 180 | ||||
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| 16 |
Valiance l FAYAT ÉNERGIE SERVICESfayat.com
Specializing in energy distribution, process installations, robotics, electromechanics, and automation in the nuclear sector, with expertise in maintenance, electrical installations, and technical assistance |
166 | |||
| 17 |
LS SERVICESls-services.com
A specialized cooperative in energy services including water, electricity, and gas, offering energy-saving solutions through brands focusing on electric vehicle charging, LED lighting, and surface disinfection Partnered with Sun-Connect for solar panels in 2022 |
163 | |||
| 18 |
SUNZILsunzil.com
Company designs, installs, operates solar power plants for professionals, communities in island, tropical zones with extreme climates, isolated sites. |
157 | |||
| 19 |
Valservevalserve.com
Design, manufacture, and maintenance of specialized valves for nuclear reactors, military defense, and cryogenic systems involving liquefied gases like hydrogen and helium. |
149 | |||
| 20 |
mylight150mylight150.com
Provides solar panels, virtual batteries, and energy management systems to cut household electricity bills by half for a sustainable energy future. |
145 | |||
| 21 |
ROBATELrobatel.fr
Design, manufacture, and maintenance of mechanically welded equipment for nuclear industry including transport casks, hotcells, radiological protection, and waste treatment installations. |
124 | |||
| 22 |
Groupe SERLgroupe-serl.fr
Develops and builds quality living spaces with residents and stakeholders to support ecological, social, and economic transitions in territories. |
119 | |||
| 23 |
Terre et Lac Solaireterreetlac.com
Independent producer designing, building, and operating ground-mounted, rooftop, parking, and floating solar installations for local authorities, companies, and farmers via rental or turnkey solutions. |
112 | |||
| 24 |
ISOWATTisowatt.fr
A key player in energy renovation since 2007, focusing on sustainable housing transformation through solar energy, ecological insulation, and geothermal heating and cooling solutions |
109 | |||
| 25 | 97 | ||||
| 26 | 91 | ||||
| 27 |
Tunzini Maintenance Nucléairetunzinimn.fr
Specializing in nuclear maintenance during reactor shutdowns, conducting mechanical work, inspections, and radiological measurements Focus on continuous improvement and innovation for optimal facility availability |
91 | |||
| 28 |
DIMÉO Énergiedimeo-energie.fr
Provides customized, turnkey solar energy solutions for businesses, including self-consumption, resale, building construction, and photovoltaic canopies across various sectors. |
85 | |||
| 29 |
Elyse Energyelyse.energy
development, financing, construction, and operation of plants producing e-methanol and sustainable aviation fuels using CO2 capture and hydrogen electrolysis |
85 | |||
| 30 |
Graphitech Nucleargraphitech-nuclear.com
Engineering company specializing in developing remote-operation tools and machinery for decommissioning nuclear reactors with graphite technology, focusing on global projects and partnerships |
80 | |||
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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 Nov 11, 2026.
More company lists in the Rhône department
- The largest companies in the Rhône department 4,813
- Multinational companies in the Rhône department 577
- Companies with in-house R&D in the Rhône department 509
- Professional services firms in the Rhône department 400
- Manufacturers in the Rhône department 322
- Retail chains in the Rhône department 302
- IT services companies in the Rhône department 286
- SaaS companies in the Rhône department 284
- Software Development companies in the Rhône department 264
- IT Services and IT Consulting companies in the Rhône department 253
- Hardware manufacturers in the Rhône department 243
- Consulting firms in the Rhône department 242
- Business Consulting and Services companies in the Rhône department 219
- Distributors and wholesalers in the Rhône department 185
- Higher Education companies in the Rhône department 155
- Education providers in the Rhône department 154
- Law Practice companies in the Rhône department 152
- Real Estate companies in the Rhône department 151
- Family-owned companies in the Rhône department 149
- Subscription businesses in the Rhône department 149
- Construction companies in the Rhône department 140
- Pharmaceutical companies in the Rhône department 134
- Financial services firms in the Rhône department 132
- Advertising Services companies in the Rhône department 126
The same list elsewhere in France
- Energy companies in France 1,594
- Energy companies in Île-de-France 475
- Energy companies in Auvergne-Rhône-Alpes 236
- Energy companies in Nouvelle-Aquitaine 173
- Energy companies in the Hauts-de-Seine department 144
- Energy companies in Occitanie 128
- Energy companies in Provence-Alpes-Côte d'Azur 124
- Energy companies in Grand Est 115
- Energy companies in Hauts-de-France 74
- Energy companies in Pays de la Loire 66
- Energy companies in the Gironde department 61
- Energy companies in the Bouches-du-Rhône department 58
- Energy companies in Brittany 56
- Energy companies in the Haute-Garonne department 48
- Energy companies in the Nord department 42
- Energy companies in the Isère department 41
- Energy companies in the Loire-Atlantique department 40
- Energy companies in Bourgogne-Franche-Comté 38
- Energy companies in the Hérault department 38
- Energy companies in Normandy 38
- Energy companies in the Bas-Rhin department 33
- Energy companies in Paris 187
- Energy companies in Lyon 34
- Energy companies in Toulouse 33