# The 30 largest energy companies in the Hérault department

Tamtam tracks 38 energy companies headquartered in the Hérault department. This list ranks the 30 largest by number of employees on LinkedIn, led by URBASOLAR, Valeco and DYNEFF. Their median headcount is 92. Half of them were founded in 2009 or later. The most common headquarters are Montpellier (20) and Mauguio (2).

The Hérault department hosts a concentration of companies primarily focused on renewable energy. These are mostly mid-sized firms, with several established around the mid-2000s. URBASOLAR, Valeco, and Arkolia are key players in developing, financing, and operating wind and solar power plants. DYNEFF, founded in 1958, provides a broader range of fuels and energy services.

Many of these companies, such as Apex Energies, Gensun, and LUXEL, specialize in solar electric power generation and related services, including design, construction, and maintenance. A notable pattern is the strong presence of headquarters in Montpellier, indicating a regional cluster for energy businesses.

🇫🇷 Hérault · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [URBASOLAR](https://www.tamtam.ai/c/urbasolar) (urbasolar.com)<br>Develops, finances, builds, operates professional photovoltaic plants, offering innovative solutions for diagnosis and building implementation. | Renewable Energy Power Generation | 🇫🇷 Montpellier | 423 | 2006 |
| 2 | [Valeco](https://www.tamtam.ai/c/valeco) (groupevaleco.com)<br>Design, finance, build, operate, and maintain wind farms and solar power plants, focusing on renewable energy production and sales. | Services for Renewable Energy | 🇫🇷 Montpellier | 416 | 1995 |
| 3 | [DYNEFF](https://www.tamtam.ai/c/dyneff) (dyneff.fr)<br>A leading energy provider for 63 years, offering a wide range of fuels, renewables, and energy services to professionals, individuals, and local communities | Oil and Gas | 🇫🇷 Montpellier | 401 | 1958 |
| 4 | [Arkolia](https://www.tamtam.ai/c/arkolia) (arkolia.com)<br>An integrated French multi-energy energizer, active in solar, wind, and green gas, develops and operates power plants, ensuring design, construction, maintenance. | Solar Electric Power Generation | 🇫🇷 Mauguio | 282 | 2009 |
| 5 | [Apex Energies](https://www.tamtam.ai/c/apex-energies) (apexenergies.fr)<br>Transforms solar into an economic and strategic lever for businesses, communities, and landowners through tailored solar project management and maintenance across France. | Solar Electric Power Generation | 🇫🇷 Montpellier | 216 | 1991 |
| 6 | [Gensun](https://www.tamtam.ai/c/gensun) (gensun.fr)<br>GenSun specializes in designing, building, operating, and maintaining solar power plants in France and internationally, with a focus on sustainability and efficiency | Services for Renewable Energy | 🇫🇷 Montpellier | 200 | 2007 |
| 7 | [LUXEL](https://www.tamtam.ai/c/luxel) (luxel.fr)<br>LUXEL specializes in designing, developing, and operating renewable energy production facilities, managing all aspects from conception to decommissioning for solar projects | Services for Renewable Energy | 🇫🇷 Montpellier | 154 | 2008 |
| 8 | [Genvia](https://www.tamtam.ai/c/genvia) (genvia.com)<br>Clean hydrogen technology venture enabling decarbonization with high-performance electrolyser and fuel cell systems, strategic alliances, and giga factory for production | Renewable Energy Equipment Manufacturing | 🇫🇷 Béziers | 151 | 2021 |
| 9 | [Dalkia Air Solutions](https://www.tamtam.ai/c/dalkia-air-solutions) (dalkiaairsolutions.fr)<br>Provides solutions for compressed air, nitrogen, and breathable air production, treatment, and networks, focusing on energy performance improvement for industrial and nuclear clients. | Industrial Machinery Manufacturing | 🇫🇷 Montpellier | 138 | 1981 |
| 10 | [Vensolair](https://www.tamtam.ai/c/vensolair) (vensolair.fr)<br>Development of wind farms, solar photovoltaic plants, battery storage, and renewable hydrogen through local stakeholder engagement and technical expertise for regional energy transition. | Services for Renewable Energy | 🇫🇷 Montpellier | 128 | 2005 |
| 11 | [Altémed](https://www.tamtam.ai/c/altemed) (altemed.fr)<br>Public group specializing in responsible urban development, social housing management, and renewable energy projects to support metropolitan community transitions. | Government Administration | 🇫🇷 Montpellier | 118 | 2022 |
| 12 | [A+ énergies \| Installateur de panneaux solaires photovoltaïques et batterie de stockage](https://www.tamtam.ai/c/a-energies-installateur-de-panneaux-solaires-photovoltaiques-et-batterie-de) (aplusenergies.fr)<br>Installation of photovoltaic panels, storage batteries, heat pumps, and energy home automation providing turnkey self-consumption solutions for residential and professional clients throughout France. | Services for Renewable Energy | 🇫🇷 Castries | 115 | 2010 |
| 13 | [SIREOS](https://www.tamtam.ai/c/sireos) (sireos.com)<br>A company specializing in engineering, constructing, and maintaining large-scale photovoltaic power plants with a focus on teamwork, excellence, and sustainability | Construction | 🇫🇷 Mauguio | 103 | 2022 |
| 14 | [Elements](https://www.tamtam.ai/c/elements) (elements.green)<br>Green electricity production from solar, wind, hydro plants. Synchronizes local consumption with renewable energy mix through community-rooted projects, citizen participation, and partner integration. | Electric Power Generation | 🇫🇷 Montpellier | 99 | 2015 |
| 15 | [Comwatt](https://www.tamtam.ai/c/comwatt) (comwatt.com)<br>Develops unique, patented technologies and smart energy management products for photovoltaic self-consumption, reducing energy bills and promoting local, green electricity production. | Energy Technology | 🇫🇷 Montpellier | 92 | 2013 |
| 16 | [GROUPE SERM/SA3M](https://www.tamtam.ai/c/groupe-serm-sa3m) (serm-montpellier.fr)<br>Urban development group in Montpellier focusing on residents' quality of life, eco and digital transitions, managing new neighborhoods, public facilities, and energy projects | Architecture and Planning | 🇫🇷 Montpellier | 89 | 1961 |
| 17 | [Mint](https://www.tamtam.ai/c/mint-montpellier) (mint-energie.com)<br>Provider of sustainable electricity, eco-friendly mobile plans with refurbished phones, and solar self-consumption solutions for individuals and businesses. | Services for Renewable Energy | 🇫🇷 Montpellier | 78 | 1999 |
| 18 | [IES Synergy](https://www.tamtam.ai/c/ies-synergy) (ies-synergy.com)<br>An international company specializing in designing and manufacturing charging solutions for electric vehicles, promoting decarbonization, and emphasizing strong CSR focus | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Saint-Aunès | 76 | 1992 |
| 19 | [SYRIUS SOLAR INDUSTRY](https://www.tamtam.ai/c/syrius-solar-industry) (syrius-solar.fr)<br>solar energy company with 35 years experience, expanding presence in overseas territories, France, and internationally through acquisitions | Renewable Energy Equipment Manufacturing | 🇫🇷 Lavérune | 63 | 2013 |
| 20 | [So-Tec](https://www.tamtam.ai/c/so-tec) (so-tec.fr)<br>Specializes in complete renewable energy project construction including site preparation, structure assembly, electrical connections, high voltage, CCTV, and maintenance services. | Construction | 🇫🇷 Villeveyrac | 60 | 2013 |
| 21 | [Domuneo](https://www.tamtam.ai/c/domuneo) (domuneo.com)<br>Specialists in sustainable home transformations, reducing energy bills, promoting solar energy, managing energy consumption, and hiring talent for various roles in renewable energy sectors | Solar Electric Power Generation | 🇫🇷 Montpellier | 52 | 2009 |
| 22 | [MGH Energy](https://www.tamtam.ai/c/mgh-energy) (mgh-energy.com)<br>An innovative company focused on decarbonizing maritime and air transport through sustainable synthetic fuels, sail propulsion, and electric propulsion technologies | Utilities | 🇫🇷 Pérols | 30 | 2014 |
| 23 | [EODEN](https://www.tamtam.ai/c/eoden) (eoden.fr)<br>A family entrepreneurship and investment group in France and Europe, focusing on projects with societal and environmental impact across various sectors | Holding Companies | 🇫🇷 Baillargues | 29 | 2019 |
| 24 | [Maison Solaire Voltalia](https://www.tamtam.ai/c/maison-solaire-voltalia) (maison-solaire-voltalia.com)<br>solar panel installation for homes and businesses, project study, technical visits, administrative support, consumption management, renewable energy transition support | Services for Renewable Energy | 🇫🇷 Montpellier | 20 | 2005 |
| 25 | [VOL-V](https://www.tamtam.ai/c/vol-v) (vol-v.com)<br>An independent renewable energy player in France, specializing in wind, solar, and biogas production with a focus on biomethane injection projects | Renewables & Environment | 🇫🇷 Montpellier | 12 | 2005 |
| 26 | [Latitude Solaire](https://www.tamtam.ai/c/latitude-solaire)<br>Accelerating energy transition through development, financing, and construction of photovoltaic plants, part of Groupe Ponticelli Frères | Services for Renewable Energy | 🇫🇷 Montpellier | 12 | 2021 |
| 27 | [Captain Watt](https://www.tamtam.ai/c/captain-watt)<br>A company driving ecological and energy transition through renewable energy, innovation economics, and responsible real estate on a local scale | Financial Services | 🇫🇷 Montpellier | 10 |  |
| 28 | [SolarinBlue](https://www.tamtam.ai/c/solarinblue) (solarinblue.com)<br>A French start-up specializing in offshore solar photovoltaics, aiming to decarbonize energy consumption in port, industrial, and yachting facilities | Renewables & Environment | 🇫🇷 Montpellier | 10 | 2019 |
| 29 | [LES EOLIENNES FLOTTANTES DU GOLFE DU LION](https://www.tamtam.ai/c/les-eoliennes-flottantes-du-golfe-du-lion) (info-efgl.fr)<br>The company develops, constructs, and operates a pilot farm project with three floating wind turbines off the coast, contributing to the energy transition in Occitanie region | Renewable Energy Semiconductor Manufacturing | 🇫🇷 Montpellier | 7 |  |
| 30 | [ECOTERRE ENERGIE VERTE](https://www.tamtam.ai/c/ecoterre-energie-verte) (comptoireolien.fr)<br>A leading provider of solar energy solutions in France, offering high-quality equipment to help customers achieve energy autonomy and reduce pollution | Renewable Energy Semiconductor Manufacturing | 🇫🇷 Vendargues | 6 | 2013 |

## 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 Hérault department

- [The largest companies in the Hérault department](https://www.tamtam.ai/l/largest-companies-herault) (1,461)
- [Companies with in-house R&D in the Hérault department](https://www.tamtam.ai/l/r-and-d-companies-herault) (155)
- [Retail chains in the Hérault department](https://www.tamtam.ai/l/retail-chains-herault) (131)
- [SaaS companies in the Hérault department](https://www.tamtam.ai/l/saas-companies-herault) (110)
- [Software Development companies in the Hérault department](https://www.tamtam.ai/l/software-development-companies-herault) (107)
- [Multinational companies in the Hérault department](https://www.tamtam.ai/l/multinational-companies-herault) (103)
- [Professional services firms in the Hérault department](https://www.tamtam.ai/l/professional-services-firms-herault) (84)
- [Manufacturers in the Hérault department](https://www.tamtam.ai/l/manufacturers-herault) (71)
- [Public sector organisations in the Hérault department](https://www.tamtam.ai/l/public-sector-organisations-herault) (68)
- [Education providers in the Hérault department](https://www.tamtam.ai/l/education-companies-herault) (61)
- [Hardware manufacturers in the Hérault department](https://www.tamtam.ai/l/hardware-companies-herault) (61)
- [Critical infrastructure operators in the Hérault department](https://www.tamtam.ai/l/critical-infrastructure-operators-herault) (57)
- [IT Services and IT Consulting companies in the Hérault department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-herault) (57)
- [Real Estate companies in the Hérault department](https://www.tamtam.ai/l/real-estate-companies-herault) (56)
- [Retail companies in the Hérault department](https://www.tamtam.ai/l/retail-companies-herault) (54)
- [IT services companies in the Hérault department](https://www.tamtam.ai/l/it-services-companies-herault) (53)
- [Higher Education companies in the Hérault department](https://www.tamtam.ai/l/higher-education-companies-herault) (52)
- [Family-owned companies in the Hérault department](https://www.tamtam.ai/l/family-owned-companies-herault) (50)
- [Law Practice companies in the Hérault department](https://www.tamtam.ai/l/law-practice-companies-herault) (49)
- [Accounting firms in the Hérault department](https://www.tamtam.ai/l/accounting-firms-herault) (48)
- [Healthcare providers in the Hérault department](https://www.tamtam.ai/l/healthcare-providers-herault) (48)
- [Accounting companies in the Hérault department](https://www.tamtam.ai/l/accounting-companies-herault) (48)
- [Distributors and wholesalers in the Hérault department](https://www.tamtam.ai/l/distributors-and-wholesalers-herault) (48)
- [Pharmaceutical companies in the Hérault department](https://www.tamtam.ai/l/pharmaceutical-companies-herault) (44)

## The same list elsewhere in France

- [Energy companies in France](https://www.tamtam.ai/l/energy-companies-france) (1,594)
- [Energy companies in Île-de-France](https://www.tamtam.ai/l/energy-companies-ile-de-france) (475)
- [Energy companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/energy-companies-auvergne-rhone-alpes) (236)
- [Energy companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/energy-companies-nouvelle-aquitaine) (173)
- [Energy companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/energy-companies-hauts-de-seine) (144)
- [Energy companies in Occitanie](https://www.tamtam.ai/l/energy-companies-occitanie) (128)
- [Energy companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/energy-companies-provence-alpes-cote-dazur) (124)
- [Energy companies in Grand Est](https://www.tamtam.ai/l/energy-companies-grand-est) (115)
- [Energy companies in the Rhône department](https://www.tamtam.ai/l/energy-companies-rhone) (104)
- [Energy companies in Hauts-de-France](https://www.tamtam.ai/l/energy-companies-hauts-de-france) (74)
- [Energy companies in Pays de la Loire](https://www.tamtam.ai/l/energy-companies-pays-de-la-loire) (66)
- [Energy companies in the Gironde department](https://www.tamtam.ai/l/energy-companies-gironde) (61)
- [Energy companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/energy-companies-bouches-du-rhone) (58)
- [Energy companies in Brittany](https://www.tamtam.ai/l/energy-companies-brittany) (56)
- [Energy companies in the Haute-Garonne department](https://www.tamtam.ai/l/energy-companies-haute-garonne) (48)
- [Energy companies in the Nord department](https://www.tamtam.ai/l/energy-companies-nord) (42)
- [Energy companies in the Isère department](https://www.tamtam.ai/l/energy-companies-isere) (41)
- [Energy companies in the Loire-Atlantique department](https://www.tamtam.ai/l/energy-companies-loire-atlantique) (40)
- [Energy companies in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/energy-companies-bourgogne-franche-comte) (38)
- [Energy companies in Normandy](https://www.tamtam.ai/l/energy-companies-normandy) (38)
- [Energy companies in the Bas-Rhin department](https://www.tamtam.ai/l/energy-companies-bas-rhin) (33)
- [Energy companies in Paris](https://www.tamtam.ai/l/energy-companies-paris) (187)
- [Energy companies in Lyon](https://www.tamtam.ai/l/energy-companies-lyon) (34)
- [Energy companies in Toulouse](https://www.tamtam.ai/l/energy-companies-toulouse) (33)

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Source: https://www.tamtam.ai/l/energy-companies-herault