What Kemwatt does

Kemiwatt is a French deep-tech company developing organic redox flow battery technology for stationary long-duration energy storage (4-12 hour duration). Its core innovation is an aqueous electrolyte composed of ~65% water and recyclable organic molecules that is non-flammable, PFAS-free, non-acidic, and contains no rare earth or precious materials. The system is engineered to convert existing liquid tank storage infrastructure at ports and terminals into utility-scale batteries (a stated example: 2 x 10,000 m³ tanks yields 35 MW / 140 MWh), with independent scaling of power (kW to MW) and energy (kWh to MWh) and a 20,000-cycle / 20-year operational life.

The commercial proposition targets port operators, terminal operators, and tank storage operators across Europe, with adjacent applicability to data centers seeking stable backup power. Revenue is generated through sale of the flow battery hardware and through multi-application energy storage services that stack grid congestion relief, self-consumption, renewable integration, energy arbitrage, shore power (cold ironing), and data center power quality onto a single asset. Pricing is custom project-based with no public tiers, and go-to-market is direct enterprise sales with consultative engagement; no channel intermediaries are used.

The technology was developed in 2017 (won the World Innovation Price that year), validated through pilot projects from 2019-2024, and is now transitioning to commercial tank storage projects in Europe in 2025, supported by new strategic investors Stolt Venture and Impact Ocean Capital. The company is headquartered at 11 Allée de Beaulieu, 35000 Rennes, France, operates with 1-10 employees, and is privately held. Leadership comprises CEO Guillaume Chazalet, CTO Florent Beille, and non-executive director Pierre-Yves Divet.

Name

Kemwatt

Legal name

Kemiwatt

Website

https://kemwatt.com

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

1–10 employees

Short description

Kemiwatt develops organic redox flow battery technology that converts existing liquid tank storage infrastructure at European ports and terminals into long-duration (4-12 hour) stationary energy storage assets, serving port operators, terminal operators, and tank storage operators.

Ownership category

akta.pro rank

Product category

Long-Duration Energy Storage

NAICS

Battery Manufacturing (33591)

akta.pro primary industry

Electrochemical LDES (Flow Batteries & Other Long-Duration Batteries) (EUAFADAA)

Keywords

• Organic flow battery
• Long-duration energy storage
• Stationary battery storage
• Port electrification
• Tank-to-battery conversion

Headquarters

HQ city

Pacé

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Personnel, Supply Chain, Operations, Marketing or Sales

Revenue model

1. Flow Battery System Sales: Sale of organic flow battery systems to ports and tank storage operators, converting existing tanks into long-duration energy storage assets. Systems are custom-designed for each installation with scalable power (kW to MW) and energy capacity (kWh to MWh).
2. Energy Storage Services: Ongoing energy storage services enabling multiple applications (grid relief, self-consumption, shore power, arbitrage) generating stacked revenue streams for battery owners. Multiple applications from single asset create multiple revenue streams.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Kemiwatt develops and sells organic redox flow battery technology that converts existing liquid tank storage infrastructure in ports and terminals into long-duration energy storage systems (4-12 hour capacity). The aqueous-based (~65% water), non-flammable, PFAS-free electrolyte enables safe, sustainable stationary energy storage with independently scalable power (kW to MW) and energy (kWh to MWh) capacity, delivering 20,000 cycles or 20 years of operation.

Product overview

Kemiwatt offers a single unified product: its Organic Flow Battery Technology, which converts existing liquid tank storage infrastructure in ports and terminals into long-duration energy storage systems (LDES) with 4-12 hour capacity. The technology powers multiple application solutions including Grid Congestion Relief, Self-Consumption, ENR Integration, Energy Arbitrage, Shore Power, and Data Center Stable Energy - all built on the same core flow battery platform that provides independent scalability of power (kW to MW) and energy capacity (kWh to MWh), with a lifespan of 20,000 cycles or 20 years.

Differentiator

Problem solved

Functional benefit

Products and services

• Organic Flow Battery Technology Aqueous-based redox flow battery system (~65% water, non-flammable, non-acidic pH, PFAS-free) that converts existing liquid tank storage infrastructure in ports and terminals into long-duration energy storage assets with 4-12 hour capacity, scalable from kilowatts to megawatts and kilowatt-hours to megawatt-hours, with a lifespan of 20,000 cycles or 20 years. Targeted at port operators, tank storage operators, and terminal operators.
• Tank-to-Battery Conversion Projects Custom enterprise project engagements converting existing port tank infrastructure into mega-battery installations (e.g., 2×10,000m³ tanks producing 35MW-140MWh capacity), delivering multi-application energy storage services including grid congestion relief, self-consumption, shore power, energy arbitrage, ENR integration, and data center backup.

Quantifiable outcome

• 2×10,000m³ tanks = 35MW-140MWh battery capacity
• +2 more outcomes

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Emerging players

• Form Energy: US-based developer of iron-air battery systems targeting 100+ hour LDES. Competes in the same long-duration stationary storage category as Kemiwatt with a different (iron-air) chemistry, attracting similar utility and industrial customer interest for multi-day storage applications.
• Highview Power: UK-based developer of liquid air energy storage (LAES) for long-duration grid storage. Competes in the same LDES market as Kemiwatt with a different (cryogenic/thermal) storage modality, and has commercial-scale projects in the UK and beyond - relevant for benchmarking LDES commercial scaling.
• Energy Vault: Swiss-US company developing mechanical gravity-based LDES systems. Competes in the same long-duration energy storage market as Kemiwatt but with a fundamentally different (mechanical) technology approach; relevant for comparing LDES go-to-market dynamics and customer overlap.

Broad incumbents

• Fluence Energy: Global battery energy storage system integrator (joint venture between Siemens and AES), serving utility-scale and large commercial customers. Broad incumbent offering lithium-ion BESS solutions that often compete head-to-head with flow batteries for grid-services and commercial storage RFPs.
• Tesla Energy (Megapack): Tesla's utility-scale lithium-ion BESS product, dominant in the grid-scale storage market. Not a direct chemistry competitor to Kemiwatt's flow batteries, but a broad incumbent competing for the same grid-services, port-electrification, and large commercial storage budgets.
• Sumitomo Electric: Large Japanese industrial conglomerate with one of the longest commercial track records in vanadium redox flow batteries (since the 1990s). A broad incumbent offering flow battery systems as part of a much wider electrical equipment portfolio, with comparable technology category but very different scale and go-to-market.

Direct peers

• Redflow: Australia-listed developer of zinc-bromine flow batteries for commercial and industrial storage. Direct competitor in the flow battery category, focusing on modular long-duration systems for off-grid, telecom, and commercial applications.
• Invinity Energy Systems: UK-listed vanadium flow battery company commercializing modular flow battery systems for grid-scale and commercial storage. Direct competitor in the flow battery / LDES category, with overlapping applications in renewables integration, microgrids, and behind-the-meter storage.
• ESS Inc. US-based developer of iron flow batteries for long-duration stationary storage. Most directly comparable to Kemiwatt - both target the LDES market with flow battery chemistry, both are scaling commercial deployments, and both serve utility and commercial customers seeking safer, longer-duration alternatives to lithium-ion.
• CellCube (Enerox): Austrian/Canadian vanadium redox flow battery manufacturer with commercial deployments globally. Direct competitor selling flow battery systems into utility and microgrid applications, with overlapping customer profiles to Kemiwatt's port and industrial customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds1 record

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Kemwatt