What Volterion does

Volterion GmbH & Co. KG is a German flow battery technology company headquartered in Dortmund, founded in 2015 as a spin-off of the Fraunhofer Institute UMSICHT. The company designs, develops, and manufactures high-tech stacks and stationary flow battery storage systems for commercial and industrial energy storage applications. Its core technology is the vanadium redox flow battery stack — the electrochemical heart of flow battery systems — with in-house graphite bipolar plate development and manufacturing as a key proprietary capability. The product portfolio comprises four stack variants (vanadiumStack, stackPACK, organicSTACK, and smartSTACK) and two complete storage systems (energyFB at ~140 kWh for long-duration storage and powerRFB at ~13 kWh for high-cycle applications), with modular scaling up to 2.5 MW in a 40-foot container.

Volterion operates a direct enterprise sales model targeting commercial and industrial operators, wind and solar plant operators, e-mobility charging infrastructure providers, and R&D organizations. Revenue is generated primarily through hardware sales of flow battery systems and modular stacks, supplemented by engineering and consulting services for custom test and laboratory systems. Pricing is not publicly disclosed; systems are configured to specific application requirements with customers directed to contact the company directly. Since 2019, Volterion has been majority-owned by the Boysen Group, an automotive supplier with 25 global production locations and over 90% manufacturing automation, which serves as its manufacturing partner for automated series production of the latest stack generation in Germany. The company is a member of Flow Batteries Europe, the European industry association for flow battery technology.

Name

Volterion

Legal name

Volterion GmbH & Co. KG

Website

https://volterion.com

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Volterion designs and manufactures vanadium flow battery stacks and stationary storage systems for commercial and industrial energy storage applications, headquartered in Dortmund, Germany, and majority-owned by the Boysen Group.

Ownership category

akta.pro rank

Product category

Stationary Energy Storage Systems

NAICS

Battery Manufacturing (33591)

akta.pro primary industry

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

akta.pro secondary industries

LDES Systems Integration, EPC & Project Development (EUAFADAG), LDES Operations, Maintenance & Asset Performance Management (EUAFADAJ)

Keywords

• Vanadium flow batteries
• Commercial energy storage
• Stationary battery systems
• Battery stack manufacturing
• Electrochemical storage

Headquarters

HQ city

Dortmund

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Flow Battery Energy Storage Systems: Sale of stationary flow battery storage systems (energyFB and powerRFB) and stackPACK products to commercial and industrial customers. Systems are designed for long-term deployment, with vanadium electrolyte that does not degenerate and can be reused in other storage systems, supporting circular economics.
2. High-Tech Stacks: Sale of vanadiumStack, organicSTACK, and smartSTACK products as modular components for energy storage systems, sold directly to customers as components or incorporated into larger system solutions.
3. Engineering Services: Engineering and consulting services for test and laboratory systems, including support for research projects and custom electrolyte testing or pilot storage systems.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Volterion develops and manufactures vanadium flow battery stacks and complete stationary energy storage systems for commercial and industrial customers. Its product portfolio covers modular electrochemical stacks (vanadiumStack, stackPACK, organicSTACK, smartSTACK) and two pre-configured systems — the energyFB (~140 kWh capacity) for long-term storage and the powerRFB (~13 kWh capacity) for high-cycle applications — plus engineering services for custom test and laboratory systems.

Product overview

Volterion is a globally recognized specialist in high-tech stacks and stationary flow storage systems for the commercial sector. The product portfolio consists of four distinct stack products: vanadiumStack (core vanadium flow battery stack with modular 20-50 cell configurations up to 7.5 kW), stackPACK (pre-configured system with six vanadiumStacks at 36 kW, scalable to 2.5 MW), organicSTACK (for organic electrolytes with modular membrane evaluation), and smartSTACK (enhanced version with integrated sensors and monitoring). Two complete storage systems are offered: energyFB (capacity model with ~140 kWh for long-term storage) and powerRFB (power model with ~13 kWh for multiple daily cycles). The company also provides Engineering Services for custom test and laboratory systems. All products are manufactured in Germany, with stacks produced in automated series production through manufacturing partner Boysen Group.

Differentiator

Problem solved

Functional benefit

Products and services

• vanadiumStack

Quantifiable outcome

• Annual CO2 savings of approximately 11 tons per energyFB storage system
• +5 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Two partnerships are on record, tiered core and minor.

• Boysen GroupcoreStrategic or Co-development Partner · 1 January 2019The Boysen Group acquired majority shares of Volterion in 2019, bringing its preferred manufacturing partner on board. As one of the fastest-growing suppliers to the international automotive industry, the Boysen Group operates 25 locations worldwide with an automation degree of well over 90%. Boysen serves as Volterion's manufacturing partner for automated series production of the latest stack generation in Germany, applying automotive-quality manufacturing standards, process reliability, and rigorous quality control throughout the production chain.
• Flow Batteries EuropeminorOthersVolterion is a member of Flow Batteries Europe (FBE), a European industry association representing the flow battery sector. Membership provides industry representation, networking, and standards advocacy.

Scale indicators5 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• ESS Inc. US-based flow battery manufacturer using iron-based electrolyte chemistry for long-duration stationary storage. Competes in the same LDES category for commercial and utility customers, offering an alternative non-flammable chemistry with similar use cases.
• Elestor: Dutch flow battery developer using hydrogen-bromine chemistry for stationary storage. Targets similar European commercial and industrial segments with a different but competing flow battery architecture.
• Largo Clean Energy: Division of Largo Inc. providing vanadium redox flow battery systems with vertical integration into vanadium electrolyte supply. Competes directly with Volterion's vanadium-based stationary storage offering for commercial and industrial customers.
• Invinity Energy Systems: UK/Canada-headquartered manufacturer of vanadium flow battery systems targeting commercial, industrial, and utility-scale storage. Most direct competitor to Volterion, offering modular vanadium flow battery stacks and integrated systems for similar C&I and renewable integration use cases.
• Enerox GmbH (CellCube): Austrian manufacturer of vanadium redox flow battery energy storage systems under the CellCube brand. Directly comparable product portfolio and target market in European commercial and industrial storage, with multi-year operating history in the same chemistry space.

Regional players

• Schmid Energy Systems: German energy storage system provider offering a range of battery-based commercial storage solutions. Regionally adjacent competitor within the DACH market serving similar commercial and industrial customer segments.

Broad incumbents

• ABB: Global electrification and automation major providing utility-scale energy storage systems and grid solutions. Serves as a broad incumbent with the engineering, integration, and project execution capabilities that smaller flow battery specialists must partner with or compete against.
• Siemens Energy: Global energy technology major offering grid-scale energy storage solutions, including battery-based and alternative chemistry systems. Competes as a broad incumbent with turnkey project capabilities and established utility relationships across Europe.
• Sumitomo Electric Industries: Large Japanese industrial conglomerate with one of the longest-running commercial vanadium redox flow battery product lines. Operates as a broad incumbent with deep R&D resources and global reach across multiple business segments beyond energy storage.
• Lockheed Martin (GridStar Energy): US defense and aerospace major with a flow battery product line (GridStar) targeting commercial and utility-scale storage. Competes as a deep-pocketed broad incumbent with capabilities extending well beyond energy storage.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/volterion

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds12 records

Investors6 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 Volterion