What Cellcube does

CellCube is the commercial brand of Enerox GmbH, an Austrian vanadium flow battery (VFB) manufacturer founded in 2001 and headquartered in Wiener Neudorf, Austria. The company designs, manufactures, and deploys modular long-duration energy storage systems for utilities, commercial and industrial customers, defense, remote/off-grid operations, healthcare, mining, and medical-device applications. CellCube's product line scales from the FB 10-100 (10kW / 100kWh) up through the FB 250-1000 and FB 500-2000 (500kW / 2MWh) configurations, with independent power and capacity scaling and storage durations of 4–24+ hours. Differentiated technical features include a non-degrading vanadium electrolyte that is 100% reusable across the system's life, a UL9540A-certified water-based electrolyte, a 30-year service life with a 20,000+ cycle guarantee, and operating-temperature tolerance from −40°C to +50°C. The company reports 140+ systems deployed across 20+ countries with more than 6 million cumulative operating hours, positioning it among the most field-validated VFB vendors globally.

The business model is multi-pronged: (1) direct hardware sales of VFB systems to end customers, (2) project development and implementation services, and (3) Energy-as-a-Service (EaaS) offerings delivered through channel partners under long-tenor agreements (e.g., Bernhard's 25-year contracts in healthcare/industrial markets). Distribution is augmented through value-added reseller relationships such as the partnership with G&W Electric for the North American grid market. Critical inputs are de-risked through a 5-year electrolyte supply agreement with U.S. Vanadium LLC for the North American market. Geographically the company is expanding from its Austrian base into North America via a Denver-area office, with the U.S. Department of Defense (Defense Innovation Unit) representing a flagship customer relationship anchored by a $19M megawatt-scale system award in October 2024. CellCube is also a founding member of the Long Duration Energy Storage (LDES) Council, signaling active participation in industry advocacy and standards work.

Revenue mechanics are project-driven rather than subscription-led: large multi-million-dollar hardware contracts (typified by the DoD award) and EaaS cash flows under long-duration service agreements dominate. CellCube's strategic posture combines the credibility of an established installed base with a deliberate up-market shift toward MW-class systems, defense microgrids, and channel-originated recurring revenue — moves that expand the addressable market but also raise execution complexity in a competitive long-duration storage landscape.

Name

Cellcube

Legal name

CellCube Energy Storage GmbH

Website

https://cellcube.com

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

51–100 employees

Short description

CellCube (Enerox GmbH) is an Austrian vanadium flow battery manufacturer serving utilities, commercial/industrial customers, defense, healthcare, and remote microgrids with modular long-duration storage systems (10kW to multi-MW, 4–24+ hour duration) backed by 140+ deployments across 20+ countries.

Ownership category

akta.pro rank

Product category

Long-Duration Energy Storage (Vanadium Flow Batteries)

NAICS

Battery Manufacturing (335910)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

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

akta.pro secondary industries

Battery Management Systems (BMS) & Pack Electronics Manufacturing (EUAFABAJ), Cell Manufacturing (Cylindrical, Prismatic, Pouch) (EUAFABAG), Hybrid Renewable + Storage Plant Integration (Solar+Storage, Wind+Storage) (EUAEAEAE), Microgrid EPC, Integration & Commissioning (Design-Build, Interconnection) (EUAFAJAI)

Keywords

• Vanadium flow batteries
• Long-duration energy storage
• Grid-scale battery systems
• Redox flow battery technology
• Industrial energy storage

Headquarters

HQ city

Wiener Neudorf

HQ country

Austria

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Vanadium Flow Battery Systems (Hardware Sales): Sale of complete vanadium flow battery systems including power stacks, electrolyte tanks, and battery management systems. Modular systems sold as FB250, FB500, FB667 units with configurable power and duration.
2. Project Development & Implementation: Full-service project delivery including development, installation, and commissioning of energy storage systems for commercial, industrial, and utility customers.
3. Energy-as-a-Service (EaaS): Long-term service agreements providing ongoing operation and maintenance of battery systems, including the 25-year EaaS agreement model with partners like Bernhard for healthcare facilities.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels6 records

Core offering

CellCube designs, manufactures, and sells modular vanadium redox flow battery (VRFB) energy storage systems, marketed as the FB series (FB 10-100, FB 200-400, FB 250-1000, FB 333-4h, FB 333-8h, FB 500-2000, FB 667-4h). The systems deliver long-duration energy storage (4 to 24+ hours) for commercial, industrial, utility, off-grid, and government/defense customers, with independent scaling of power and capacity. The company also offers Energy-as-a-Service (EaaS) financing and operation agreements through channel partners.

Product overview

CellCube is a vanadium flow battery technology company that offers a modular, scalable line of long-duration energy storage systems branded under CellCube. The product portfolio centers on vanadium redox flow batteries (VRFBs) ranging from compact 10 kW/100 kWh units to multi-MW configurations, with storage durations from 4 to over 24 hours. The FB series (FB 10-100, FB 200-400, FB 250-1000, FB 333, FB 500-2000, FB 667) provides independent scaling of power and capacity through modular power stacks and electrolyte tanks. The company complements its hardware with Energy-as-a-Service (EaaS) offerings for financing and operations. All systems are designed and manufactured in Austria with a guaranteed minimum 20,000 cycles over 30 years service life.

Differentiator

Problem solved

Functional benefit

Products and services

• CellCube FB 10-100 A compact vanadium flow battery system offering 10 kW power and 100 kWh capacity, designed for small-scale microgrid and residential applications with over 14 years of continuous field operation.
• CellCube FB 200-400 A vanadium flow battery system providing 200 kW power and 400 kWh capacity, suitable for commercial and light industrial energy shifting and peak shaving applications.
• CellCube FB 250-1000 A modular vanadium flow battery offering 250 kW power and 1 MWh capacity, designed for grid-scale renewable integration, frequency regulation, and microgrid applications.
• CellCube FB 333-4h A vanadium flow battery system with approximately 333 kW power and 4-hour duration storage capability, designed for commercial and industrial applications requiring extended discharge periods.
• CellCube FB 333-8h A long-duration vanadium flow battery system with approximately 333 kW power and 8-hour storage capacity, optimized for grid stabilization and peak demand coverage.
• CellCube FB 500-2000 A mid-scale vanadium flow battery providing 500 kW power and 2 MWh capacity, designed for commercial, industrial, and utility-scale applications including renewable integration and resilient microgrids.
• CellCube FB 667-4h A high-capacity vanadium flow battery system with approximately 667 kW power and 4-hour duration, suitable for larger commercial and utility applications.
• Energy-as-a-Service (EaaS) Integrated Energy-as-a-Service offerings providing financing, installation, and operational services for CellCube battery systems, delivered through partnerships with utilities, healthcare, and higher education sectors.

Quantifiable outcome

• 30-year service life with no degradation of nameplate capacity or electrolyte
• +3 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Ten partnerships are on record, tiered flagship, core and minor.

• U.S. Department of Defense (DoD) / DIUflagshipStrategic or Co-development Partner · 9 October 2024$19 million combined funding for megawatt-scale vanadium flow battery deployment under Extended Duration Storage for Installations (EDSI) project. System to be deployed with U.S. Marine Corps to enhance energy resilience at DoD installations.
• Potelco Inc.coreImplementation/ SI/ Consulting Partner · 9 October 2024Project partner for deployment of CellCube VFB system as part of DoD EDSI project, providing installation and commissioning support.
• LeidoscoreImplementation/ SI/ Consulting Partner · 9 October 2024Project partner for DoD EDSI project bringing engineering and integration expertise for military base energy resilience systems.
• Electric Power Research Institute (EPRI)coreTechnology or Integration · 9 October 2024Technical collaboration partner providing expertise for CellCube VFB system integration and validation for DoD deployment.
• National Renewable Energy Laboratory (NREL)coreTechnology or Integration · 9 October 2024Partner providing technical validation and performance testing for DoD energy storage deployment.
• Long Duration Energy Storage Council (LDES Council)coreStrategic or Co-development Partner · 15 August 2024Industry coalition launched at COP26 with mission to enable renewable energy to replace fossil fuels through zero-carbon energy storage. CellCube joined as founding member to drive change in energy storage industry.
• U.S. VanadiumcoreStrategic or Co-development Partner · 24 February 20225-year supply agreement for up to 3 million liters per year of ultra-high-purity vanadium electrolyte with price cap. Secures long-term supply assurance for North American operations and reduces dependency on volatile vanadium pricing. Electrolyte is regionally processed within North America ensuring deliverability at competitive prices.
• BernhardcoreChannel Partner/ Reseller/ DistributorOne of the largest privately-owned infrastructure firms in America with over 100 years of experience. Partner for Energy-as-a-Service agreements, integrating CellCube vanadium flow batteries into comprehensive energy solutions for healthcare facilities like Conway Medical Center.
• G&W ElectriccoreChannel Partner/ Reseller/ DistributorUS-based power grid solutions provider integrated four CellCube VFB units for own microgrid, then became Value-Added Reseller. Now includes CellCube systems in their microgrid solutions portfolio for customers.
• SES (Strategic Energy Solutions)minorChannel Partner/ Reseller/ DistributorPartner logo displayed on About Us page, providing integrated Energy-as-a-Service offerings to customers in utilities, healthcare and higher education sectors.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• Highview Power: UK-based long-duration energy storage company using liquid air/cryogenic technology for grid-scale storage. Competes with CellCube for utility-scale long-duration projects but addresses a different storage modality and duration profile.
• Form Energy: US LDES startup developing iron-air battery systems targeting 100+ hour duration. Competes with CellCube in the broader long-duration energy storage category for utility-scale decarbonization, though with a different chemistry suited for multi-day rather than 8-24 hour storage.
• Energy Vault: US/Swiss-based gravity and kinetic energy storage company targeting long-duration utility applications. Competes with CellCube for LDES procurement budgets at utilities and large C&I customers, though with fundamentally different storage physics.

Direct peers

• Invinity Energy Systems: UK-headquartered vanadium redox flow battery manufacturer offering modular VRFB systems for grid-scale and microgrid applications. Most direct competitor to CellCube, with overlapping product lines (endurance series), shared target customers in utilities and C&I, and similar technology positioning around long-duration flow batteries.
• VRB Energy: Canada/China-based vanadium redox flow battery company delivering utility-scale and microgrid storage systems globally. Direct competitor in VRFB chemistry with comparable modular architecture, duration offerings (4-12+ hours), and customer segments in renewables integration and remote microgrids.
• ESS Inc. US-based flow battery manufacturer producing iron flow batteries for long-duration commercial and utility-scale storage. Direct competitor in the flow battery category targeting the same LDES use case, with overlapping customer profile in C&I, utilities, and microgrids despite different electrolyte chemistry.

Broad incumbents

• NGK Insulators: Japanese industrial ceramics and battery manufacturer with significant deployed base of sodium-sulfur (NAS) batteries for grid storage and active investments in redox flow battery technology. Large incumbent competing with CellCube for utility-scale long-duration projects globally.
• Sumitomo Electric Industries: Japanese diversified manufacturer with a redox flow battery product line and substantial utility-scale deployments globally. Competes with CellCube in VRFB for grid and industrial applications as part of a much broader portfolio including power cables, electronics, and industrial systems.
• Saft (TotalEnergies): French industrial battery manufacturer (TotalEnergies subsidiary) with established lithium-ion grid storage products and selected flow battery offerings. Competes with CellCube in utility, defense, and industrial storage markets through a broader battery portfolio.
• Fluence Energy: US-headquartered energy storage integrator and provider (joint venture between Siemens and AES) with large-scale lithium BESS deployments globally. Competes with CellCube for utility and C&I storage procurement, though currently focused primarily on shorter-duration lithium-ion rather than long-duration flow.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/cellcubeenergy
• LinkedInlinkedin.com/company/cellcube

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 Cellcube