The energy sector in Haute-Garonne features a mix of companies across various segments, from traditional power generation to renewable energy services and smart technology. Many are mid-sized firms, alongside younger companies founded in the last decade. SPIE Industrie, with 1781 employees, supports industrial clients in digital transformation and energy transition. SHEM Société Hydro-Electrique du Midi develops and operates hydropower stations, while GRDF Occitanie manages the natural gas distribution network.
A notable pattern is the concentration of headquarters in Toulouse, indicating a regional hub for energy businesses. Companies like ilek provide green energy solutions with a focus on local supply chains. SOLVEO Energies develops and operates photovoltaic and wind farms, and ZE-WATT designs and installs electric vehicle charging stations. This shows a strong emphasis on renewable energy development and associated infrastructure.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SPIE Industriespie.fr
Support industrial clients with digital transformation and energy transition through design, implementation, and maintenance of energy-efficient installations. |
1,781 | |||
| 2 | 370 | ||||
| 3 |
SHEM Société Hydro-Electrique du Midishem.fr
Development and operation of hydro-power stations with extensive infrastructure, ensuring safety, environmental preservation, and regional protection. |
230 | |||
| 4 |
Groupe Alliaservalliaserv.fr
Specializes in green space management, multi-service maintenance, and operation of heating, ventilation, air conditioning, and renewable energy installations. |
201 | |||
| 5 |
GRDF Occitaniegrdf.fr
Operates France's natural gas distribution network, ensuring access for households and businesses, maintaining infrastructure, and supporting energy transition initiatives. |
181 | |||
| 6 | 152 | ||||
| 7 |
SOLVEO Energiessolveo-energies.com
Develops, finances, builds, and operates photovoltaic and wind farms, active in green mobility, with 300+ power plants in operation. |
135 | |||
| 8 |
FOURNIE GROSPAUD SYNERYSfgsynerys.fr
Specializing in control-command equipment for electrical energy, offering expertise in production, transmission, and distribution Providing solutions for modernizing energy infrastructures with digital equipment |
85 | |||
| 9 |
ZE-WATTze-watt.com
Design and installation of electric vehicle charging stations with site audits, civil works, maintenance, supervision, and customer support services. |
77 | |||
| 10 |
INTEGRA Metering Ultrasonicsontex.com
Development production sale of water energy meters and data management systems for utilities property managers and building operators |
73 | |||
| 11 |
Dietsmann Francedietsmann.com
The largest independent specialist in operating and maintaining energy production plants. They also handle construction, trade, supply management, and offer training services. |
71 | |||
| 12 |
AMK ENERGYamkgroupe.com
A Toulouse-based company specializing in photovoltaic installation for professionals, offering sustainable and profitable solutions as part of the AMK group founded in 2020 |
38 | |||
| 13 |
H3 Dynamicsh3dynamics.com
Development of zero-emission electric aircraft, hydrogen production and supply infrastructure, and sustainable aviation fuel enablement for clean air transport. |
37 | |||
| 14 | 35 | ||||
| 15 |
GEOTHERMECOgeothermeco.fr
A specialized energy consulting company partnering with Engie, Geotherm-Eco assists individuals in purchasing gas and electricity at the best prices and conditions |
35 | |||
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| 16 |
Eco-Tech Ceramecotechceram.com
Specializes in industrial heat and energy storage solutions, offering turnkey technical and financial services to reduce energy consumption and carbon footprint. |
30 | |||
| 17 |
MECOSUNmecosun.fr
Designing, manufacturing, and selling photovoltaic solar support solutions in France and internationally |
27 | |||
| 18 |
Bohr Energiebohr-energie.fr
An AI company specializing in optimizing energy assets on European power markets |
24 | |||
| 19 | 21 | ||||
| 20 |
Enosisenosis-energies.com
The company develops and sells equipment to recycle CO2, produce renewable gas, and facilitate the integration of electricity and gas networks |
21 | |||
| 21 |
SDEHG - Syndicat départemental d’énergie de la Haute-Garonnesdehg.fr
An essential public institution in Haute-Garonne, supporting energy services, energy transition, and infrastructure development for communities in the region |
20 | |||
| 22 |
H2PULSEh2pulse.com
Specializing in hydrogen energy solutions for industries like aeronautics, railways, and road transport, H2PULSE accelerates research knowledge transfer and deployment of innovative hydrogen solutions |
19 | |||
| 23 | 18 | ||||
| 24 |
VIARÉNOenergieb.fr
Specializes in energy efficiency services including insulation, carpentry, heating, air conditioning, and self-consumption with full project management and maintenance. |
16 | |||
| 25 |
Soleil Du Midi Développementsoleildumidi.fr
Specializing in renewable and community energy solutions, this company focuses on sustainable practices for a cleaner and more efficient future |
16 | |||
| 26 |
Swan-H
Develops a patented chemical process to produce ammonia from renewable energy, aiming to overcome hydrogen production, storage, and transport challenges for a carbon-free future. |
13 | |||
| 27 |
Energies Nouvelles Courtageencpro.fr
Specializing in financing and supporting photovoltaic projects for farmers and industries, offering tailored solutions, free feasibility studies, and project management from start to finish |
12 | |||
| 28 |
SUNSHINE POWERsunshinepower.fr
Specializing in roofing, cladding, and solar panel installation on agricultural and industrial buildings in southern France Experienced, insured, and dedicated to client satisfaction |
12 | |||
| 29 | 9 | ||||
| 30 |
Bynergiebynergie.com
Specialized company in renewable energies with RGE certification, ensuring environmental quality and sustainable energy solutions |
8 | |||
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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 Nov 13, 2026.
More company lists in the Haute-Garonne department
- The largest companies in the Haute-Garonne department 2,402
- Companies with in-house R&D in the Haute-Garonne department 323
- Multinational companies in the Haute-Garonne department 246
- Retail chains in the Haute-Garonne department 222
- Professional services firms in the Haute-Garonne department 208
- Aerospace and defence companies in the Haute-Garonne department 186
- Manufacturers in the Haute-Garonne department 159
- IT services companies in the Haute-Garonne department 158
- IT Services and IT Consulting companies in the Haute-Garonne department 152
- SaaS companies in the Haute-Garonne department 147
- Consulting firms in the Haute-Garonne department 145
- Software Development companies in the Haute-Garonne department 140
- Hardware manufacturers in the Haute-Garonne department 137
- Public sector organisations in the Haute-Garonne department 110
- Business Consulting and Services companies in the Haute-Garonne department 104
- Real Estate companies in the Haute-Garonne department 104
- Aviation and Aerospace Component Manufacturing companies in the Haute-Garonne department 102
- Distributors and wholesalers in the Haute-Garonne department 98
- Education providers in the Haute-Garonne department 94
- Family-owned companies in the Haute-Garonne department 72
- Financial services firms in the Haute-Garonne department 69
- Higher Education companies in the Haute-Garonne department 66
- Critical infrastructure operators in the Haute-Garonne department 64
- Retail companies in the Haute-Garonne department 63
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 116
- Energy companies in the Rhône department 104
- 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 Nord department 42
- Energy companies in the Isère department 41
- Energy companies in the Loire-Atlantique department 40
- Energy companies in the Hérault department 38
- Energy companies in Normandy 38
- Energy companies in Bourgogne-Franche-Comté 37
- Energy companies in the Bas-Rhin department 33
- Energy companies in Paris 187
- Energy companies in Lyon 34
- Energy companies in Toulouse 33