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30 leading energy companies in the Loire-Atlantique department

Tamtam tracks 40 energy companies headquartered in the Loire-Atlantique department. This list ranks the 30 largest by number of employees on LinkedIn, led by Chantiers de l'Atlantique, Sercel and AS 24. Their median headcount is 42. Half of them were founded in 2010 or later. The most common headquarters are Nantes (13), Saint-Herblain (3) and Bouguenais (2).

🇫🇷 Loire-Atlantique30 companiesUpdated Nov 14, 2026

The energy sector in Loire-Atlantique features a mix of established industrial players and younger companies focused on renewable energy. Chantiers de l'Atlantique, founded in 1861, is a marine construction company building complex ships. Sercel provides subsurface measurement solutions, while AS 24 specializes in fuel distribution for heavy goods vehicles. Lhyfe focuses on green industrial hydrogen production, and Vaillant Group France develops heating and cooling systems using renewable energy.

A notable pattern is the concentration of companies in Nantes, which serves as a hub for both traditional and emerging energy businesses. The area also shows a strong emphasis on renewable energy, with firms like Dome Solar manufacturing photovoltaic mounting systems, Beem offering solar solutions for homes, and Armor Battery Films enhancing lithium-ion battery performance.

#CompanyIndustryHeadquarters EmployeesFounded
1
Chantiers de l'Atlantiquechantiers-atlantique.com

Marine construction company, building complex ships and marine installations, including passenger ships and substations. Global leader in design, manufacturing, and commissioning of innovative, environmentally friendly vessels.

Shipbuilding 🇫🇷 Saint-Nazaire 2,472 1861
2
Sercelsercel.com

Leading provider of high-standard subsurface measurement and data solutions for natural resources, infrastructure monitoring, energy transition, and defense sectors since 1956.

Manufacturing 🇫🇷 Carquefou 942 1956
3
AS 24as24.com

Specialized fuel distribution network for heavy goods vehicles across 29 countries, offering secure transactions, competitive prices, and dedicated stations.

Oil and Gas 🇫🇷 Saint-Herblain 380 1988
4
MADIC groupgroupe.madic.com

innovative French industrialist in electronic payment, petroleum equipment, services, and Digital Media communication, with a focus on sustainable development values.

Oil and Gas 🇫🇷 Nantes 267 1971
5
MADIC SASgroupe.madic.com

A French leader in payment and petrol equipment and services, providing customized solutions for gas stations, renovations, and compliance updates across France, Spain, and Belgium

Oil and Gas 🇫🇷 Nantes 237 1971
6
Lhyfelhyfe.com

Pure player deploying modular, 100% green industrial hydrogen production plants for mobility and industry, clean and accessible.

Renewable Energy Power Generation 🇫🇷 Nantes 217 2017
7
Vaillant Group Francejobs.vaillant-group.com

Development and manufacturing of heating and cooling systems focused on renewable energy, providing comfort and customized solutions in France.

Renewable Energy Equipment Manufacturing 🇫🇷 Nantes 205 n/a
8
Knutsen LNG Franceknutsenoas.com

A subsidiary of Knutsen OAS Shipping managing LNG carriers sailing under the RIF Flag with French officers from a French office

Maritime Transportation 🇫🇷 Nantes 165 n/a
9
Leroux & Lotz Technologies (LLT)lerouxlotz.com

Design and manufacture of custom biomass boilers and combustion systems, including maintenance, refurbishment, and complete rebuild services.

Utility System Construction 🇫🇷 Nantes 149 1946
10
Territoire d'énergie Loire-Atlantique (TE44)te44.fr

Manages public electricity and gas distribution networks, maintains street lighting, invests in renewable energy infrastructure, and operates electric vehicle charging stations.

Government Administration 🇫🇷 Orvault 92 1938
11
Dome Solardome-solar.com

French leader manufacturing high quality photovoltaic mounting systems for flat and sloped roofs across industrial, commercial, and agricultural sectors with certified technical assistance.

Renewable Energy Semiconductor Manufacturing 🇫🇷 Rezé 73 2008
12
Beembeemenergy.fr

Helping individuals take charge of their energy consumption and accelerate the transition to cleaner energy sources for homes

Solar Electric Power Generation 🇫🇷 Nantes 70 2018
13
SYSTOVIsystovi.com

Specializing in creating and producing cutting-edge BIPV systems that seamlessly integrate solar panels into building structures for energy generation

Solar Electric Power Generation 🇫🇷 Carquefou 54 2008
14
Sunologysunology.eu

Provider of residential solar solutions including plug-and-play stations, smart custom roofs, modular batteries, and monitoring applications for home energy autonomy and savings.

Retail Appliances, Electrical, and Electronic Equipment 🇫🇷 Saint-Herblain 46 2019
15
Armor Battery Filmsarmorbatteryfilms.com

Specializing in enhancing lithium-ion battery performance, En' Safe® provides aluminum/copper foil coated with a conductive primer to improve anode/cathode interface for increased safety and longevity

Chemical Manufacturing 🇫🇷 Nantes 42 2015

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16
DINTECgokinell.com

Family-owned company specializing in custom solutions for mobile machine manufacturers, combining expertise in electronics, hydraulics, and more to create innovative and high-quality projects

Machinery Manufacturing 🇫🇷 Nantes 42 2010
17
ALKA MARINEalkamarine.com

A new player in renewable marine energy support, offering integrated solutions from design to maritime operations, owns a tugboat and a bathymetric vessel under the French flag

Maritime Transportation 🇫🇷 Saint-Nazaire 40 2020
18
GAROS ENERGIEgaros-energie.fr

Electrotechnical manufacturing company located in France specializing in energy solutions and electrical components

Electrical Equipment Manufacturing 🇫🇷 Bouguenais 39 1984
19
GeniWattgeniwatt.fr

GeniWatt offers turnkey solutions for diesel and gas power plants, providing installation, commissioning, maintenance, and supply of certified replacement parts

Mechanical Or Industrial Engineering 🇫🇷 La Chevrolière 38 2011
20
PHOTOVOLTphotovolt.fr

Photovolt specializes in designing and installing solar panels for residential and commercial clients, offering services from consultation to installation and maintenance

Renewable Energy Semiconductor Manufacturing 🇫🇷 Thouaré-sur-Loire 38 2006
21
Libre Energielibre-energie.com

Specializing in solar energy production since 2007, we aim to provide clean energy solutions for individuals and businesses with personalized and quality service

Solar Electric Power Generation 🇫🇷 Les Sorinières 37 2007
22
hestiiago.hestiia.com

Innovative company leveraging wasted heat from computers to create sustainable consumer products, driving the energy transition towards a greener future

Appliances, Electrical, and Electronics Manufacturing 🇫🇷 Nantes 26 2016
23
Be Greenbegreen-group.fr

Design, manufacture, and install solar power plants, solar buildings, canopies, and charging stations with integrated expertise and comprehensive support.

Renewable Energy Equipment Manufacturing 🇫🇷 Saint-Herblain 25 2019
24
Enerdigitenerdigit.fr

Electricity flexibility operator providing financial compensation for load shedding and developing large-scale battery storage projects to ensure grid security and energy transition.

Services for Renewable Energy 🇫🇷 Nantes 24 2015
25
GEPS Technogeps-techno.com

Harvest ocean data, enable offshore communication networks, power subsea equipment with marine renewable energies, develop customized innovative solutions.

Services for Renewable Energy 🇫🇷 Guérande 22 2011
26
SYCOMOREkeon-group.com

Sycomore specializes in operating and maintaining agricultural and territorial biogas units, with a team of experienced multidisciplinary professionals #biomethane #biogas

Transportation, Logistics, Supply Chain and Storage 🇫🇷 Bouguenais 21 2014
27
PNE Francepne-france.fr

Develops, builds, and operates wind and solar farms across metropolitan territory, integrating human and environmental stakes in renewable energy projects.

Renewable Energy Power Generation 🇫🇷 Nantes 20 2003
28
Hellospark ⚡️hellospark.fr

French company specializing in renewable energy and electric mobility, transforming unused spaces into solar energy centers with photovoltaic canopies to reduce carbon footprint

Renewable Energy Power Generation 🇫🇷 Nantes 18 n/a
29
2G Energie France SAS2-g.com

Design and supply of turnkey biogas and natural gas cogeneration plants with patented engines, remote monitoring, and nationwide technical support in France.

Renewable Energy Semiconductor Manufacturing 🇫🇷 Sainte-Luce-sur-Loire 18 2016
30
NEOS SOLAIRE - Orvaultneos-solaire.fr

NEOS specializes in tailored photovoltaic solutions for businesses, focusing on energy efficiency, financial optimization, and sustainability for a greener future

Services for Renewable Energy 🇫🇷 Orvault 18 2022

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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 14, 2026.

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