Best Energy Efficiency Companies in France
The 88 best Energy Efficiency companies in France in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Kyotherm.
France's Energy Efficiency sector has 88 companies tracked in our directory, ranked by disclosed equity funding and recent momentum. Total disclosed funding sits at $372M, and one name dominates that pool hard: Kyotherm alone accounts for $309M, leaving Engie at $27M, Selfee at $14M, and the rest well below $10M. No unicorns yet, but the funding concentration tells you something real about where institutional capital is landing.
So what's actually moving? App-layer signals are one honest proxy for demand, and median install growth across energy sector apps is running at roughly +28% year-on-year across 138 tracked titles. The hot themes right now aren't broad efficiency plays but specific ones: solar electricity generation, solar PV, photovoltaic systems. Coverage of the wider efficiency space is flat, which means the action has migrated toward generation-side solar rather than consumption-side savings. I'd watch that gap. Investors like Bpifrance, Demeter, and Credit Mutuel Equity are the most active backers in this cohort, and if you're scanning for who's writing checks into French clean-energy infrastructure, those three names will keep coming up.
Our analysis of 50 Energy Efficiency companies
$1.3b in tracked funding; 52% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2011.
Ranked: Best Energy Efficiency companies in France
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Kyotherm Provider of turnkey financing for industrial decarbonization projects | $309M | 1 mo ago | Series C | — | 2011 | WordPressMySQLPHP+23 | — | — |
| 2 | Engie Provider of electricity generation and other energy services | $27M | 28 mo ago | Public | Catherine Macgregor CEO | 2008 | Cart FunctionalityDrupalAlgolia+25 | 668 patents Advanced gas sampling, measurement, liquefaction, and biogas conditioning technologies. | — |
| 3 | Selfee Provider of renewable electricity consumption services | $14M | 38 mo ago | Series A | Sandra Magnin Co-Founder | 2017 | — | — | 1 job opening |
| 4 | ESR Group Provider of multi-technical services for building maintenance and installation. | $8M | 256 mo ago | Series A | — | 2005 | WordPressMySQLPHP+19 | — | — |
| 5 | The ALTYN group Energy and climate actor committed to the energy, environmental, and digital transition of buildings and… | $5M | 81 mo ago | Series A | Alban Lapierre Founder & CEO | 2004 | WordPressMySQLPHP+32 | — | 1 partnership · 1 award |
| 6 | Syroco Provider of AI-driven maritime voyage optimization software. | $3M | 18 mo ago | Series A | Yves Montcheuil Co-Founder | 2018 | HubSpot CMS HubAmazon Web Servicescore-js+16 | — | — |
| 7 | GreenFlex Offers audit, consulting and operational advice to renewable energy sector | $2M | 65 mo ago | Acquired | — | 2009 | WordPressApple iCloud MailMicrosoft 365+30 | — | 1 award |
| 8 | SUNiBrain Manufacturer of industrial solutions optimizing photovoltaic power plants and increasing solar yields | $2M | 122 mo ago | Deadpooled | — | 2013 | — | — | — |
| 9 | BOOSTHEAT Provider of LED lighting system | $795K | 92 mo ago | Public | Jean Joffroy Co-Founder | 2011 | sNewsYouTubeUIKit+8 | 77 patents High-efficiency combined heat and power systems using hybrid thermodynamic compressors | — |
| 10 | GROUPE ATLANTIC Manufacturer of heating, water heating, and air conditioning systems. | — | 25 mo ago | Acquired | Pierre Lamoure Co-Founder | 1968 | BootstrapYouTubeVarnish+17 | 20 patents Electric domestic water‑heater storage tanks with immersion heating, corrosion‑protective anodes, and rotary controls | — |
| 11 | Ayrton Distributor of LED lighting system | — | 28 mo ago | Acquired | — | 2001 | WordPressApple iCloud MailMySQL+31 | 78 patents Advanced optical systems for high‑intensity searchlights and laser‑based projectors | — |
| 12 | Legrand Provider of electrical and digital products and solutions for building infrastructures | — | 29 mo ago | Public | John Selldorff CEO & President | 1860 | DrupalPHPChart.js+20 | 232 patents Electrical wiring and distribution systems, including modular raceways, conduit accessories, and residual current devices. | — |
Top 12 Energy Efficiency companies in France
#1
Series C · Paris, Ile de France · founded 2011 · 9 employees$309.3Mraised▾
Provider of turnkey financing for industrial decarbonization projects. It finances the entire investment cost through heat supply or energy performance contracts. The company participates in the co-development of decarbonization projects, leveraging technical, contractual, and financial expertise. This allows energy consumers to outsource operational risks and focus on their core business. Financing is offered for projects up to a certain investment amount, with contracts ranging from seven to twenty-five years. Collaboration with energy service companies and project developers ensures a turnkey solution encompassing design, construction, operation, maintenance, and financing.
- Apr 2026Conventional Debt$234.6M
- Mar 2022Series C$49.2M
- Apr 2019Series B$20.3M
- Jul 2016Series A$5.3M
#2
Series A · Marseille, Provence Alpes Cote d Azur · founded 2018$3.2Mraised▾
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- Dec 2024Series A$7.9M
- Jun 2023Series A$3.2M
- Sep 2020Seed$1.6M
#3
Public · Paris, Ile de France · founded 2008 · 96454 employees$27.2Mraised▾
Provider of electricity generation and other energy services. It is a global energy actor and expert in electricity, natural gas, and energy services. The company provides access to sustainable energy, mitigation, and adaptation to climate change, the security of supply and rational use of resources. It also offers tailored energy services to sectors such as cities, industries, tertiary businesses, and individuals to support zero-carbon targets and energy efficiency. In 2022, the company recorded annual revenues of $98.65B and a net profit of $0.23B.
- Feb 2024Post IPO—
- Nov 2023Grant (prize money)$371.7K
- Dec 2021Grant (prize money)$3.2M
- Sep 2021Grant (prize money)$408K
#4
Series A · Paris, Ile de France · founded 2017 · 6 employees$13.6Mraised▾
Provider of renewable electricity consumption services
- Apr 2023Series A$12M
- Apr 2022Seed$1.6M
- Jul 2021Seed—
#5
Series A · Nantes, Pays de la Loire · founded 2004$5.5Mraised▾
It is a company engaged in the energy and climate transition of buildings and territories. They focus on improving the energy performance of buildings and offer a range of services in the field.
- Sep 2019Series A$5.5M
#6
Series A · Colomiers, Occitanie · founded 2005 · 71 employees$7.8Mraised▾
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- Feb 2005Series A$7.8M
#7
Acquired · Paris, Ile de France · founded 2009 · 550 employees$2.3Mraised▾
Offers audit, consulting and operational advice to renewable energy sector
- Jan 2021Grant (prize money)$257.1K
- Mar 2019Grant (prize money)$567K
- May 2018Grant (prize money)$324.6K
- Mar 2016Grant (prize money)$1.1M
#8
Deadpooled · Toulouse, Occitanie · founded 2013 · 9 employees$1.9Mraised▾
Manufacturer of industrial solutions optimizing photovoltaic power plants and increasing solar yields. The company specializes in devices designed to enhance solar efficiency. Its industrial approach provides clients with an easily installed, reliable, high-performing, and cost-effective solution. The technology uses automated physical actions in real time and remotely. It utilizes air, wind, and rainwater to extract solar energy more effectively. The objective is to improve the management of photovoltaic plants and extend the lifespan of equipment.
- Apr 2016Conventional Debt$370.1K
- Apr 2016Seed$825.7K
- Dec 2015Seed$1.1M
#9
Public · Lyon, Auvergne Rhone Alpes · founded 2011 · 19 employees$795.2Kraised▾
Provider of LED lighting system
- Oct 2018Grant (prize money)$741.9K
- Dec 2016Grant (prize money)$53.3K
#10
Acquired · Arcueil, Ile de France · founded 1968—raised▾
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#11
Acquired · Villebon sur Yvette, Ile de France · founded 2001—raised▾
Distributor of LED lighting system
- Jan 2024Seed—
- Aug 2022Seed—
#12
Public · Limoges, Nouvelle Aquitaine · founded 1860 · 37134 employees—raised▾
Provider of electrical and digital products and solutions for building infrastructures. They offer products and solutions for power, light, and data management. They provide their solutions to hotels, residential properties, offices, data centers, shopping centers, healthcare, and others.
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Efficiency coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Energy Efficiency & Buildings is moving in France
A read on the academic research around Energy Efficiency & Buildings — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 525 France-affiliated papers.
- Centre National de la Recherche Scientifique116
- École Polytechnique Fédérale de Lausanne34
- Nantes Université21
- Université de Lorraine21
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives18
- Energy management11→22
- Photovoltaic system2→11
- Renewable energy3→12
- Microgrid3→8
- Passive cooling1→5
- Energy management35→69
- Microgrid9→33
- Energy management system15→39
- Renewable energy15→35
- Photovoltaic system11→29
- Heat pump1→6
Where energy efficiency is researched across France
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing energy efficiency patents in France
France energy efficiency patent filing is accelerating — 190 filings from 239 assignees (2016–2025), led by Valeo Systemes Thermiques, Commissariat Energie Atomique, Zodiac POOL CARE Europe; annual filings 25→38.
- Valeo Systemes Thermiques25
- Commissariat Energie Atomique15
- Zodiac POOL CARE Europe13
- Electricite DE France12
- XEDA International11
- Peugeot Citroen Automobiles11
- SUEZ INT11
- Renault9
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.