KEMIWATT

What KEMIWATT does

KEMIWATT, founded in 2014 in Rennes, France as a spin-off from the Institute of Chemical Sciences in Rennes, manufactures aqueous organic redox flow batteries (ORFB) for long-duration energy storage. Its core technology uses proprietary organic molecules dissolved in a water-based alkaline electrolyte (~65% water), producing non-flammable, PFAS-free, non-acidic chemistry that contains no heavy metals, rare earths, or precious metals. The architecture separates power (electrochemical stacks) from energy (electrolyte stored in tanks), enabling independent scaling for 4-12 hour LDES applications and a rated lifespan of 20,000 cycles or 20 years. The system includes electrochemical stacks, an Energy Management System for price-responsive optimization, and is designed to integrate with existing tanks, pipelines, and pumps at industrial sites.

The company sells custom-engineered battery systems and develops tank storage projects for European port authorities, terminal operators, tank storage operators, and adjacent industrial customers such as data centers and e-mobility hubs. Revenue streams include one-time system sales, project development services, and potential technology licensing through Tier 1 industrial partnerships. Customers cited in case studies include a Northern Europe port terminal, a large cruise and cargo port, and a Netherlands tank storage operator, with documented customer outcomes of 3.8-6 year ROI and double-digit IRR. The go-to-market is direct enterprise field sales targeting decision-makers via expert consultation, with strategic investors Stolt Ventures and Impact Océan Capital joining in 2025 to accelerate international deployment.

Name

KEMIWATT

Legal name

Kemiwatt

Website

https://kemiwatt.com

Company type

Private

Founded year

2014

Operating status

Operating

Headcount range

1–10 employees

Short description

KEMIWATT manufactures aqueous organic redox flow batteries that repurpose existing port and tank storage infrastructure into long-duration energy storage systems. It sells custom-engineered battery systems and project development services to European port authorities, terminal operators, and industrial customers.

Ownership category

akta.pro rank

Product category

Long-Duration Energy Storage / Industrial Flow Batteries

NAICS

Battery Manufacturing (33591), Battery Manufacturing (335910)

SIC

Motors & Generators (3621)

akta.pro industry

PRIMARYEUAFADAA

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

Energy, Utilities & Environment/Energy Storage & Grid Flexibility (Batteries, Hydrogen Storage, Demand Response)/Long-Duration Energy Storage (LDES) (Thermal, Mechanical, Flow, Gravity)

SECONDARYIMAGAHAJ

Energy Storage Software & Controls (EMS, monitoring, optimization, cybersecurity)

Industrials, Manufacturing & Construction/Electrical Equipment & Industrial Electronics/Batteries, Energy Storage & Charging Equipment (Industrial ESS, chargers)

SECONDARYEUAFABAI

Battery Pack Manufacturing & Module Assembly

Energy, Utilities & Environment/Energy Storage & Grid Flexibility (Batteries, Hydrogen Storage, Demand Response)/Battery Materials, Cells & Packs Manufacturing

Keywords

• Redox flow batteries
• Long-duration energy storage
• Organic flow batteries
• Port energy storage
• Industrial battery systems

Headquarters

HQ city

Rennes

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Organic Flow Battery System Sales: Sale of aqueous organic flow battery systems to ports, terminals, and industrial customers. Systems are sized for specific customer needs with power (stacks) and energy (tank volume) independently scalable.
2. Project Development: Developing tank storage projects in Europe for customers. Includes system design, integration with existing infrastructure, and project execution.
3. Technology Licensing and Components: Collaborates with Tier 1 industrial partners on manufacturing critical components. Potential licensing of technology and electrolyte formulations.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Kemiwatt designs, manufactures, and integrates Aqueous Organic Redox Flow Battery (ORFB) systems that convert existing liquid tank infrastructure in ports and terminals into long-duration (4–12 hour) energy storage assets. The company delivers custom-engineered battery systems combining standardized electrochemical stacks, water-based organic electrolytes stored in customer or repurposed tanks, and an Energy Management System for grid services, self-consumption, shore power, and arbitrage. It also provides project development services and collaborates with Tier 1 industrial partners on manufacturing key components.

Product overview

Kemiwatt offers a single unified product: the Aqueous Organic Redox Flow Battery (ORFB) system for long-duration energy storage. The core offering consists of electrochemical stacks combined with existing tank infrastructure as electrolyte reservoirs, supported by an Energy Management System (EMS) for optimization and grid services. The architecture separates power (stacks) from energy (tank volume), enabling independent scaling of storage duration by increasing electrolyte volume without changing power blocks. Systems are designed for 4-12 hour storage duration, targeting ports, terminals, and tank storage operators who can repurpose existing liquid storage tanks into megawatt-scale battery assets.

Differentiator

Problem solved

Functional benefit

Products and services

• Aqueous Organic Redox Flow Battery (ORFB) System Water-based organic flow battery system for long-duration energy storage (4–12 hours) targeting ports, terminals, and tank storage operators. Uses organic molecules dissolved in alkaline solution (~65% water) as electrolytes, with electrochemical stacks for power conversion and separate tanks for positive and negative electrolytes. Power and energy capacity are independently scalable, and the chemistry is non-flammable, PFAS-free, and free of heavy metals, rare earths, and precious metals.
• Port Tank Storage Project Development End-to-end project development service that converts existing liquid tank storage in European ports and terminals into long-duration energy storage assets, including system design, integration with existing tanks/pipelines/pumps, and project execution for customers in the port and maritime sectors.

Quantifiable outcome

• 80% cost reduction compared to standard utility prices
• +7 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Tier 1 Industrial PartnerscoreTechnology or IntegrationKemiwatt develops standardized building blocks for stacks, balance of plant and electrolyte management in collaboration with Tier 1 industrial partners for manufacturing critical components. Also collaborates with academic laboratories on electrolytes and membranes.

Scale indicators11 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• ESS Inc. US-based iron flow battery company focused on long-duration stationary storage for utilities, microgrids and commercial customers. Comparable as a non-lithium, non-vanadium flow battery alternative pursuing the same LDES market window.
• Invinity Energy Systems: UK-based vanadium redox flow battery manufacturer targeting commercial, industrial and utility-scale long-duration storage. Most directly comparable to Kemiwatt as a flow battery specialist competing for similar LDES use cases and enterprise customers.
• CellCube (Enerox): Austrian/German vanadium redox flow battery developer with a long history of large-scale stationary storage deployments. Closely comparable flow battery technology stack and target applications in industrial and grid storage.
• VoltStorage: Munich-based developer of vanadium redox flow batteries for commercial and industrial customers in Europe. Competes head-to-head with Kemiwatt in the European commercial and industrial LDES segment.
• Elestor: Netherlands-based flow battery company using hydrogen-bromine chemistry for large-scale stationary storage. Comparable as a European flow battery peer pursuing long-duration applications with similar industrial customers.
• Redflow: Australia-based zinc-bromine flow battery manufacturer focused on commercial and industrial customers, including remote and off-grid sites. Comparable as an alternative-chemistry flow battery specialist targeting C&I LDES applications.

Emerging players

• VFlowTech: Singapore-based vanadium flow battery start-up focused on commercial and industrial storage in Asia-Pacific. Partially comparable as an emerging flow battery challenger expanding into industrial and grid-scale use cases.

Broad incumbents

• Sumitomo Electric: Large Japanese conglomerate with one of the longest-running commercial vanadium redox flow battery programs. Relevant as a broader incumbent in flow battery technology with established utility-scale deployments worldwide.
• Saft (TotalEnergies): Industrial battery division of TotalEnergies producing a wide range of energy storage systems, including lithium-ion and nickel-based solutions for grid, industrial and mission-critical sites. Relevant broad incumbent with overlapping industrial and utility storage customers.
• Lockheed Martin (GridStar Energy): US defense and energy major offering the GridStar flow battery product line for grid-scale storage. Comparable as a large, well-capitalized player entering the flow battery LDES market with substantial R&D and deployment resources.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/kemwatt

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

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 KEMIWATT