| # | Company | Employees |
|---|---|---|
| 1 |
Plastic Omniumplasticomnium.com
Provides innovative automotive solutions: exterior systems, lighting, clean energy, and complex modules. Focuses on zero-carbon mobility through hydrogen and electrification. |
9,551 |
| 2 |
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 |
| 3 |
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 |
| 4 |
groupe DUBREUILgroupedubreuil.com
French family group involved in distribution, aviation, and hospitality, operating diverse businesses across France and overseas for a century. |
1,475 |
| 5 |
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 |
| 6 |
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 |
| 7 |
Verkorverkor.com
Produces low-carbon batteries in France and Europe for electric vehicles and stationary storage, with a Gigafactory operational by 2025. |
997 |
| 8 | 920 | |
| 9 |
Cegelec CEMcegelec-cem.fr
Designs, builds, and integrates equipment for new nuclear constructions, renovations, decommissioning, and high-stakes mechanical and electromechanical engineering projects in nuclear environments. |
770 |
| 10 |
Comeca Groupcomeca-group.com
Designs, manufactures, and maintains energy management solutions for industries, buildings, energy, infrastructure, and transport worldwide. Works with major electrical industry players. |
716 |
| 11 |
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 |
| 12 |
ARDATEMardatem.fr
Studies, installs, commissions, and maintains electrical, instrumentation, automation, and technical equipment in energy and nuclear sectors, including electronic product development. |
526 |
| 13 |
PRODEVALprodeval.com
A leading company specializing in treating organic waste through anaerobic digestion, producing biomethane for city gas networks and BioCNG vehicles worldwide |
401 |
| 14 |
GEG - Gaz Electricité de Grenoblegroupe.geg.fr
Energy production, distribution, and supply with focus on renewable sources, sustainability, and community engagement across France. |
386 |
| 15 |
Mexens ex.Technique Solairemexens.com
French independent renewable energy producer deploying solar photovoltaic and biogas infrastructures in France and internationally, decarbonizing economy and contributing to sustainable development. |
383 |
| 16 |
Groupe MAÏAgroupe-maia.com
Diverse expertise supporting sustainable territorial development through infrastructure, renewable energy, heritage, biodiversity, and economic and tourism growth projects. |
377 |
| 17 |
CLIMAWATTclimawatt.com
It specializes in photovoltaic energy and energy savings, offering expert guidance and support for solar energy projects and installations. |
341 |
| 18 |
Ineo Nuclearequans.fr
Support for nuclear industry players with multi-technical solutions covering new builds, retrofits, maintenance, operation, and decommissioning services. |
330 |
| 19 |
MasterGridmastergrid.com
MasterGrid specializes in electrical system services from high to low voltage, providing tailored solutions to optimize system lifecycle and improve environmental impact |
328 |
| 20 |
Waga Energywaga-energy.com
This company converts landfill gas into Renewable Natural Gas (RNG) using patented technology, reducing CO2 emissions and supplying households with biomethane |
316 |
| 21 |
ENERGY POOLenergy-pool.com
Energy Pool optimizes energy consumption, decentralized production, and storage to achieve smarter, low-carbon energy management, leading developments in multiple countries |
305 |
| 22 |
FOSELEV AGINTISfoselev.com
Specializes in piping projects for oil and gas, chemical, nuclear, power, and pharmaceutical industries, providing industrial piping solutions. |
298 |
| 23 |
Chloridechloride.com
Designing, manufacturing, servicing industrial UPS systems securing critical equipment power supply across industries worldwide. Safeguarding people and assets through innovative solutions. |
282 |
| 24 |
Aventechaventech-e.com
Designs, industrializes, and produces critical high/low voltage electrical equipment for harsh environments, offering integrated solutions like shelters, skids, and industrial switchboards. |
267 |
| 25 |
JST transformateursjst-transformers.com
Design, manufacture, and maintain electric transformers for clients across five continents, with a focus on innovation and sustainable development. |
256 |
| 26 |
IRISOLARISirisolaris.com
Develops and produces solar energy, constructs and maintains photovoltaic plants for businesses and communities, actively participating in energy transition. |
242 |
| 27 |
ACMacm-acr.fr
Design and manufacture of pressure equipment for nuclear, pharmaceutical, chemical, petrochemical, and renewable energy sectors with 75 years expertise. |
219 |
| 28 |
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 |
| 29 | 180 | |
| 30 |
Nidec ASI S.A.S.nidec-conversion.com
Specializing in energy storage solutions in Europe, the company creates high-quality equipment for electric networks, EV charging stations, and infrastructure electrification |
178 |
| 31 |
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 |
| 32 |
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 |
| 33 |
MICHAUDmichaud.fr
The company provides low-voltage electrical distribution network managers and installers with connection solutions for aerial and underground connections, electric vehicle charging, and distribution panels |
158 |
| 34 |
SUNZILsunzil.com
Company designs, installs, operates solar power plants for professionals, communities in island, tropical zones with extreme climates, isolated sites. |
157 |
| 35 |
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 |
| 36 |
TCL SunPower Globalsunpowerglobal.com
Development and provision of innovative solar energy solutions for homeowners, businesses, and energy producers to promote sustainability worldwide. |
146 |
| 37 |
mylight150mylight150.com
Provides solar panels, virtual batteries, and energy management systems to cut household electricity bills by half for a sustainable energy future. |
145 |
| 38 |
SCANTECHscantech.com
Designs, builds, sells, installs, maintains innovative measurement equipment to monitor quality of flat materials during production, particularly in extrusion and new energy markets. |
144 |
| 39 |
INES - Institut National de l'Energie Solaireines-solaire.org
Research, expertise, and training in advanced solar technologies, system integration, and smart energy management for energy transition. |
141 |
| 40 |
SOREAsorea-maurienne.fr
A local mixed economy company distributing electricity in the Maurienne valley, serving 14,000 contracts, with potential for energy production and demand management |
138 |
| 41 |
Compagnie de Chauffagecompagniedechauffage.fr
Management and operation of an extensive urban heat network supplying over 100,000 homes with 82% renewable and recovered energy. |
138 |
| 42 |
GROUPE LANSARDlansard.fr
Renewables and Environment company based in Rhone-Alpes, France, specialized in the development and implementation of sustainable energy solutions |
130 |
| 43 |
ROBATELrobatel.fr
Design, manufacture, and maintenance of mechanically welded equipment for nuclear industry including transport casks, hotcells, radiological protection, and waste treatment installations. |
124 |
| 44 |
Depagnedepagne.fr
Since 1920, the company specializes in manufacturing low voltage electrical connection, protection, and distribution equipment for public distribution networks |
116 |
| 45 |
Helexia Agrihelexia-agri.com
Building agricultural hangars with solar panels, operating them for farmers. This develops farming activity and generates green energy. |
114 |
| 46 |
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 |
| 47 |
STEDISstedis.com
STEDIS is a Saint-Martin-d'Hères based company specializing in fuel and AdBlue distribution, connected devices, and energy savings certificates |
111 |
| 48 |
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 |
| 49 |
Atawey Hydrogenatawey.com
A company established in 2012 designs and produces green hydrogen refueling stations, offering a range of tailored solutions for various projects |
108 |
| 50 |
Renaissance Fusionrenfusion.eu
Development of stellarator-based nuclear fusion technology aiming to simplify fusion processes, reduce electricity costs, and expand high temperature superconductor availability. |
104 |
| 51 |
HARGASSNER Francehargassner.com
Manufacturer of wood boilers and thermal solar panels promoting renewable energy with a strong dealer network and partner installers in France. |
101 |
| 52 | 97 | |
| 53 |
EDF ENR PWT (Photowatt)photowatt.com
Design and manufacture of photovoltaic wafers, cells, and modules with advanced technology and strict quality control in France. |
96 |
| 54 | 94 | |
| 55 | 91 | |
| 56 |
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 |
| 57 |
COMPTE.Rcompte-r.com
Designs and manufactures wood and biomass thermal generators, leading renewable energy solutions with international presence across Europe and North America. |
89 |
| 58 |
GreenAlpgreenalp.fr
For the past 150 years, this company has been distributing gas and electricity in Grenoble, focusing on technical expertise, customer culture, innovation, and future energy models |
85 |
| 59 |
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 |
| 60 |
Elyse Energyelyse.energy
development, financing, construction, and operation of plants producing e-methanol and sustainable aviation fuels using CO2 capture and hydrogen electrolysis |
85 |
| 61 |
Vanatomevanatome.com
industrial sealing systems for nuclear, defense, and low-carbon solutions, ensuring reliability, expertise, and innovation for energy needs. |
83 |
| 62 |
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 |
| 63 |
RAMPA Énergiesrampa-energies.com
Specializing in heritage enhancement through innovative lighting technologies and energy distribution networks, the company supports quality of life through energy efficiency and digital development |
79 |
| 64 |
SDMS la chaudronnerie blanchesdms.fr
Manufacture of specialized equipment and assemblies from noble metals for energy, nuclear, and advanced research applications with strict quality standards. |
78 |
| 65 |
Hydrogen Refueling Solutions - HRShydrogen-refueling-solutions.fr
Design manufacture install and maintain hydrogen refueling stations and industrial piping, supporting decarbonization of transport and industrial sectors in Europe. |
78 |
| 66 | 77 | |
| 67 |
Solarhonasolarhona.fr
Develops solar energy projects from prospecting to operation. Fosters an innovative and local production model with community involvement for ecological transition. |
73 |
| 68 |
INOCELinocel.com
A French company that designs, manufactures, and markets high power fuel cells for stationary, heavy ground mobility, and marine sectors with expertise in system integration and maintenance services |
72 |
| 69 |
Mecawaremecaware.com
French startup specializing in recycling technological waste to produce critical raw materials for circular economy, CO2 capture, and battery decarbonization in Lyon, France |
70 |
| 70 |
EPSYS devient CAHORS Solutions Intégréesepsys.fr
Leader in prefabricated solutions, specializing in innovative, tested, and ready-to-wire products for energy, renewables, infrastructure, telecom, data centers, and customized projects |
69 |
| 71 |
Samsolarsamsolar.fr
Specializing in solar energy production, we offer solutions such as solar hangar construction and project implementation on degraded or agricultural land Our project managers handle everything |
69 |
| 72 |
Groupe ESLCeslc.fr
Distributor of fuel and combustible in Southeast France, committed to ecological transition with multiple regional brand operations. |
67 |
| 73 |
Groupe SEGUINcheminees-seguin.com
Design, manufacture, and distribute wood and pellet heating appliances, specializing in thermal renovation with extensive international presence. |
67 |
| 74 |
OPTIMEX Pumpsoptimex-pumps.com
Design and supply of canned motor pumps with double hermetic sealing for safe handling of toxic, explosive, and valuable liquids. |
67 |
| 75 |
FREE ENERGIEfreeenergie.fr
Free Energie offers a variety of solutions for producing electricity and insulating homes, focusing on renewable energy sources and sustainability |
64 |
| 76 | 63 | |
| 77 |
SNIGtuyauterie-chaudronnerie.fr
A regional nuclear company in Rhône-Alpes specializing in industrial piping, boiler making, welding, and integrated engineering for nuclear facilities |
62 |
| 78 |
KELLAL Maintenance (une entreprise VINCI Energies)kellal-maintenance.fr
Specializing in nuclear fuel handling, from project design to maintenance of installations, KELLAL Maintenance is a trusted expert in the field |
61 |
| 79 |
WEISS FRANCE ENERGIEweiss-france.fr
WEISS France designs, constructs, and installs industrial boilers leveraging a century-old history and expertise, providing energy solutions using biomass |
60 |
| 80 |
GROUPE MOULINVESTmoulinvest.com
Family-owned company specializing in wood processing, offering a wide range of products and services in sustainable forest management, from tree to habitat. |
59 |
| 81 |
BeeBryte - New Ways for Energy Efficiencybeebryte.com
Providing innovative O&M services for HVAC-R systems in commercial buildings, using AI to optimize energy consumption, increase efficiency, and reduce carbon footprint |
57 |
| 82 |
ÖkoFEN Franceoekofen.com
Specializes in wood pellet boilers and solar heating systems, replacing oil, gas, or electric heating with renewable, local energy sources. |
57 |
| 83 |
Dracula Technologiesdracula-technologies.com
Specializes in organic photovoltaic technology, creating printed power-generating solutions from ambient light for battery-free IoT devices, meeting corporate green solution demands. |
52 |
| 84 |
Loire Industrie SASloire-industrie.fr
Supplier and stockist of forged flanges, ring rolling, machining, and heat treating for energy, aerospace, and nuclear sectors. |
51 |
| 85 |
TERACTEMteractem.fr
TERACTEM is a mixed economy company supporting local authorities in urban planning projects since 1958, focusing on creating a smart territory in Haute-Savoie |
51 |
| 86 |
Sun'Agrisunagri.fr
Develops dynamic agrivoltaics technology, protecting crops from climate change. Provides concrete, proven solutions for farmers adapting to new climate realities. |
50 |
| 87 |
ENER-PACTEener-pacte.fr
Securing existing income for large solar power plant owners. Addressing growing problem of large-scale photovoltaic installations, offering revenue stability. |
48 |
| 88 |
Monabee ☀️monabee.fr
Specializing in solar energy solutions, the company helps individuals and businesses reduce electricity bills by up to 50% through custom solar panel installations and intelligent monitoring systems |
48 |
| 89 |
Arol Energyarol-energy.com
Specializing in designing biogas upgrading units for efficient conversion of biogas into renewable energy sources |
47 |
| 90 |
Limatechlimatech.energy
Design and manufacture of certified 28V lithium batteries for aircraft providing weight savings, increased longevity, and improved availability over lead-acid and nickel-cadmium technologies. |
43 |
| 91 |
TETRADIStetradis.com
French company specializing in smart energy solutions, connectivity, photovoltaic systems, and electric mobility with personalized technical support. |
43 |
| 92 |
VINCI Energies - Activité Nucléairevinci-energies.com
Leading nuclear sector player providing engineering, maintenance, electrical systems, control systems, and mechanical solutions to support environmental transitions through specialized business units. |
41 |
| 93 |
Groupe Ovianceoviance.fr
A partner for major energy players, offering talents for project deployment in areas like general electricity, metering, home automation, plumbing, and heating |
40 |
| 94 |
Trelleborg Oil & Marinetrelleborg.com
The company specializes in providing high-performing, innovative flexible hose solutions for oil and gas transfer applications, tailored to unique requirements |
38 |
| 95 |
I & S NUCLEAIRE
A leading nuclear engineering and services company pushing boundaries with innovative solutions for a safer, more efficient, and sustainable energy future |
38 |
| 96 |
DELTALYSdeltalys.com
Specializing in optimizing renewable gas purification processes, the company helps improve profitability of biogas units, offering innovative solutions promoting quality and sustainability |
38 |
| 97 |
Mob-Energymob-energy.com
Design and manufacture of intelligent energy platforms and modular infrastructure for rapid electric vehicle charging and building energy storage without construction. |
37 |
| 98 |
Actemium Grenobleactemium.fr
Specializing in industrial process solutions, this company offers expertise in hydroelectricity, industrial processes, and gas processes, serving clients locally and globally |
37 |
| 99 |
SAEM Energiessaem-energies.fr
Specializing in electrical, climate, renewable energy, and green mobility projects, offering optimized and decarbonized solutions in construction, operation, and maintenance |
37 |
| 100 |
INOVALPinovalp.fr
An innovative industrial company in the renewable energy sector, specializing in designing and manufacturing wood pellet stoves and grills with a focus on eco-friendly solutions |
36 |
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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.
More company lists in Auvergne-Rhône-Alpes
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