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Sylfen

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Rendering decentralized renewable energy productions reliable, thanks to hydrogen storage

Le Cheylas, FranceFounded 2015Energy
Valuation $25–50M Last recorded · 2022
Revenue <$1M Latest reported FY
Headcount <100 Current team size
Total funding $10–50M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Sylfen and the history behind them.

About Sylfen

Sylfen, founded in 2015 as a spin-off from the French Alternative Energies and Atomic Energy Commission (CEA), is at the forefront of developing distributed energy systems to enhance building energy autonomy. The company was established by Nicolas Bardi and Caroline Rozain, who were later joined by Marc Potron in 2016. Their foundation is built upon more than a decade of R&D at the CEA, leveraging a portfolio of patents to address the challenges of energy transition.

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The core of Sylfen's offering is the Smart Energy Hub, an integrated solution for energy storage and co-generation. This system uniquely combines a reversible solid oxide electrolyzer with a fuel cell, allowing it to perform multiple functions. In electrolyzer mode, it converts surplus renewable electricity, such as from solar panels, into hydrogen for storage. In fuel cell mode, it uses this stored hydrogen, or alternatively biogas or natural gas, to produce both electricity and heat. This dual capability is designed to smooth out the intermittency of renewable sources, providing a stable power supply. The system is hybridized with batteries to manage rapid power fluctuations and ensure immediate energy availability.

Sylfen's business model encompasses the full lifecycle of its product, from initial building analysis and system design to manufacturing, installation, and ongoing maintenance. This full-service approach aims to maximize the return on investment for its clients. The company targets a diverse market, including commercial and public buildings like offices, logistics facilities, schools, and subsidized housing, typically ranging from 2,000 to 10,000 square meters. By recovering and utilizing the heat generated during its processes, the Smart Energy Hub can achieve an overall energy efficiency of up to 90%, significantly reducing CO2 emissions and energy costs for building owners. To date, Sylfen has raised a total of $10.5 million, with a notable Series A round in May 2022 that brought in investors such as IDEC GROUP, Supernova Invest, and CEA Investissement.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2015
Headquarters
Le Cheylas, France
Employees
8
Open positions
None listed
Dealroom signal
76.2/100
Sub-industry
Clean Energy, Energy Efficiency, Energy Storage
Sector
Energy, Smart Building, Hydrogen, Battery, Spinout, Sustainable Development Goals, Climate Tech, Stationary Energy Storage
Technology
Hardware, Deep Tech
Business model
Manufacturing
Client focus
b2b

Funding history

4 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
EARLY VCOther financing May 2022 $11M $44M Elaïs Capital · InnoEnergy · Supernova Invest · IDEC Group ↗
EARLY VCOther financing Dec 2021 $0 — CEA Investissement · InnoEnergy · IDEC —
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Financials

Revenue over time

Revenue, earnings and other financial measures where available. Years marked “E” are estimates.

YearRevenueGrowth
2026
2025
2024
2023
2022
2021
2020 —
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Growth signals

Sylfen website traffic

Latest recorded traffic for Sylfen is 320 monthly website visits, up 300% over the last three months. Sylfen's team grew 14.3% over the past year.

Latest monthly visits320 3-month web change+300% 1-year team growth+14.3%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

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Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

11 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Series A7 investors entered at this stage

  • CEA Investissement
  • InnoEnergy
  • IDEC
  • Elaïs Capital
  • Supernova Invest
  • IDEC Group
  • Crédit Agricole Alpes Développement

Other known investors4 additional known investors

  • HEC Paris
  • CEA-Leti
  • French Alternative Energies and Atomic Energy Commission - CEA
  • HEC Challenge+
Team profiled 6 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators Hidden — book a demo quality score
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
1 countries with
team presence
🇫🇷 France100%
1 country shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Sylfen on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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