What Sweetch Energy does

Sweetch Energy, founded in 2015 and headquartered in Saint-Grégoire (Rennes), France, develops and commercializes INOD® (Ionic Nano-Osmosis Diffusion) technology, a proprietary nanofluidic membrane platform that converts the salinity gradient between fresh and saltwater into continuous, 24/7 zero-emission electricity. The core product is built around bio-sourced, nano-scale membranes with high ionic selectivity that the company claims deliver a 20× power density improvement (20–25 W/m²) over earlier osmotic power technology. The platform is anchored by OPUS-1, the world's first osmotic power demonstration station in the Rhône River delta, developed in a joint venture with Compagnie Nationale du Rhône (CNR) and integrating Rockwell Automation's real-time process control and AI-powered digital twins for site optimization. Sweetch Energy also operates a 3,000 sqm pilot factory in Rennes for manufacturing INOD® osmotic generators and runs the WH2E program, which adapts INOD® to recover low-grade industrial waste heat below 100°C.

The company targets grid-scale renewable energy operators, coastal and island off-grid communities, desalination and wastewater plants, coastal industrial hubs, and industrial sites with saline effluents, with utility CNR and EDF Hydro as named anchor partners. Its business model is built on hardware sales of osmotic power generation systems under long-term power purchase agreements and utility contracts, supplemented by licensing of INOD® technology to industrial partners and energy companies. Geographically the company is expanding from its French base into Western Europe and North America, supported by a US office at Greentown Labs in Somerville, MA. Revenue is currently pre-commercial: the company has raised approximately €43.7M across multiple rounds (most recently a €25M Series A in December 2023) and recognized institutional investors include Crédit Mutuel Impact, GO Capital, Demeter Partners, Axeleo, EDF Pulse, Future Positive Capital, Bpifrance, ADEME, and the European Innovation Council. As of April 2026, leadership transitioned with Bertrand Chupin appointed CEO and co-founder Nicolas Heuzé moving to Executive Chairman, consistent with a shift from R&D to industrial commercialization.

Name

Sweetch Energy

Legal name

Sweetch Energy

Website

https://sweetch.energy

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Sweetch Energy is a French climate-tech company that develops INOD® nanofluidic membrane technology to generate continuous, zero-emission electricity from the salinity difference between fresh and saltwater, targeting utilities, coastal industries, and desalination operators.

Ownership category

akta.pro rank

Product category

Osmotic Power Generation / Blue Energy

NAICS

Electric Power Generation (22111), Turbine and Turbine Generator Set Units Manufacturing (333611)

SIC

Cogeneration Services & Small Power Producers (4991), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Salinity Gradient (Blue Energy) Power Generation (EUACAJAF)

akta.pro secondary industries

Membranes, Consumables & Chemicals (Elements, Antiscalants, Cleaning) (EUANAFAJ), Industrial Water Reuse Utilities (ZLD/MLD & Process Water Recycling) (EUANAGAG)

Keywords

• Osmotic power generation
• Salinity gradient energy
• Nanofluidic membranes
• Blue energy technology
• Renewable baseload power

Headquarters

HQ city

Rennes

HQ country

France

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Osmotic Power Generation & Sale: Sweetch Energy generates and sells continuous 24/7 clean electricity produced from osmotic power plants. Revenue comes from energy sales to grid operators and utilities under long-term power purchase agreements or utility contracts.
2. Technology Licensing: The company licenses its proprietary INOD® technology to industrial partners, utilities, and energy companies for deployment of osmotic power facilities.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Sweetch Energy develops and manufactures INOD® (Ionic Nano-Osmosis Diffusion) osmotic power systems that convert salinity gradients between fresh and saltwater into continuous 24/7 renewable electricity. The company produces bio-sourced nanofluidic membrane stacks, operates the OPUS-1 osmotic power demonstration station in the Rhône delta, and runs a 3,000 sqm pilot factory for scaling osmotic generator production. It sells these systems and licenses the underlying technology to utilities, grid operators, desalination plants, and industrial sites with saline effluents.

Product overview

Sweetch Energy offers a platform-based architecture centered on its proprietary INOD® technology, a nanomembrane-based osmotic energy conversion system. The core offering consists of INOD® technology for converting salinity differences into electricity, supported by the OPUS-1 demonstration station for real-world validation. Additional modules include INOD® Stack Manufacturing for scaled production, the WH2E waste heat recovery application, and AI-powered digital twins for site optimization. The company also provides industrial project development services targeting grid-scale renewable energy, coastal communities, desalination plants, and industrial facilities with saline effluents.

Differentiator

Problem solved

Functional benefit

Products and services

• INOD® Technology Proprietary osmotic energy conversion platform based on advanced bio-sourced nanofluidic membranes that generate electricity from the salinity difference between fresh and saltwater, with 20–25 W/m² power density (20× improvement over earlier osmotic technology) and 69 filed patents.
• OPUS-1 Osmotic Power Demonstration Station World's first osmotic power demonstration station located in the Rhône River delta, France, developed in partnership with CNR. Validates INOD® technology under real-world conditions with an estimated ~500 MW installable capacity potential in the Rhône delta alone.
• WH2E (Waste Heat to Energy) Application of INOD® ionic nano osmotic diffusion technology to recover industrial low-grade waste heat (below 100°C) from industrial processes, urban heating networks, data centers, and transport systems, converting it into clean electricity.
• INOD® Osmotic Generators (Manufacturing) Manufactured INOD® osmotic generators based on advanced nanofluidic membrane stacks and innovative fluidic designs. Production scaled through a 3,000 sqm pilot factory in Rennes, France, supplying utility, industrial, and desalination deployments.

Quantifiable outcome

• Osmotic power could supply over 15% of global electricity demand if scaled industrially
• +3 more outcomes

Named customers2 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

AI capability3 records

Feature6 records

Partnerships

Five partnerships are on record, tiered core, flagship and supporting.

• Rockwell AutomationcoreTechnology or Integration · 7 May 2024Technology partnership for OPUS-1 integration of real-time control systems using Rockwell's process control platform to optimize zero-carbon electricity generation operations.
• Compagnie Nationale du Rhône (CNR)flagshipStrategic or Co-development Partner · 20 June 2023Joint venture with CNR for OPUS-1, the world's first osmotic power demonstration station in the Rhône River delta. CNR is a major French hydroelectric operator and key strategic partner for real-world testing and validation of INOD® technology.
• Greentown LabssupportingStrategic or Co-development PartnerUS incubator partnership providing office space at Greentown Labs in Somerville, MA, supporting North American market development.
• EDF HydrocoreStrategic or Co-development PartnerPartnership commitment to roll out osmotic energy on a large scale in France and abroad, signed June 2022.
• CNRScoreStrategic or Co-development PartnerFoundational research partnership with CNRS (Centre National de la Recherche Scientifique) under Prof. Lyderic Bocquet for development of nanofluidic membrane technology.

Scale indicators11 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• SaltPower: Danish startup developing salinity gradient power technology using membranes to generate electricity from the mixing of freshwater and saltwater. Most direct competitor to Sweetch Energy in the osmotic/blue energy space.
• Statkraft: Norwegian state-owned utility that built and operated the world's first osmotic power prototype at Tofte, Norway. Although the program was halted in 2013-2014, Statkraft remains the historical reference point and an aggressive potential re-entrant in the blue energy field.
• RED Stack: Dutch company developing reverse electrodialysis (RED) technology for salinity gradient power, with pilot projects in the Netherlands. Targets the same estuary/mixing-zone sites as Sweetch Energy using a different membrane architecture.

Emerging players

• Energy Recovery: US-listed company specializing in pressure exchange and energy recovery technology for desalination and industrial processes. While focused on desalination energy recovery rather than osmotic power, it operates in the same membrane-based industrial water-energy interface where Sweetch Energy's OPUS-1 deployments sit.

Broad incumbents

• Fujifilm: Large Japanese conglomerate with a significant membrane technology division (Fujifilm Manufacturing Europe) producing reverse osmosis and desalination membranes. A potential technology partner or competitor in scaling advanced membrane production for osmotic power.
• Toray Industries: Japanese materials company and one of the world's largest reverse osmosis membrane manufacturers. Comparable to Sweetch Energy as a potential nanofluidic/specialty membrane producer and a vertical integrator threat in water-energy membrane technology.
• EDF (Électricité de France): French state-owned utility and Sweetch Energy partner (via EDF Pulse investment and EDF Hydro agreement). Comparable as a large incumbent renewable energy player evaluating next-generation baseload technologies and a probable first commercial customer.
• ENGIE: French multinational utility with major renewable energy and water/wastewater treatment operations. Comparable as a potential strategic partner, customer, or acquirer for Sweetch Energy's blue energy technology across European and global markets.
• Veolia Environnement: French multinational with major water treatment and energy services operations, including desalination and brine management. Comparable as a potential industrial customer for INOD® in saline-effluent industrial sites and a strategic acquirer/partner.

Regional players

• Compagnie Nationale du Rhône (CNR): French hydroelectric operator and Sweetch Energy's joint venture partner for OPUS-1 in the Rhône Delta. Highly comparable as the operational counterpart deploying INOD® technology in real-world conditions across European river deltas.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sweetch-energy

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds5 records

Investors9 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 Sweetch Energy