What LE System does

LE System Co., Ltd. is a Japanese energy storage technology company founded in October 2023 as a subsidiary of RS Technologies Co., Ltd., with 30 million yen in registered capital and operations across three sites: a Tokyo (Shinagawa) headquarters, a Tsukuba office, and a Namie-machi (Fukushima) manufacturing factory. The company's core product is high-purity vanadium electrolyte for Vanadium Redox Flow Batteries (VRFB), a long-duration energy storage technology in which it operates as Japan's only domestic electrolyte manufacturer. Its proprietary process recovers vanadium from electric precipitator ash (EP ash), an industrial waste from petroleum coke power plants, extracts it as ammonium metavanadate (recovering ammonia and gypsum as by-products), and converts it via calcination in a reduction furnace and electrolytic reduction into 3.5-valent VRFB electrolyte; performance is validated using in-house mini-cell, temperature characteristics (0°C–55°C), stability, and 300+ cycle long-run test equipment.

The company monetizes across four revenue streams: (1) hardware sales of VRFB electrolyte to battery manufacturers and project developers, with specifications adjustable per customer requirements; (2) end-to-end grid-scale battery energy storage system (BESS) services that participate in Japan's electricity markets, including the Demand-Supply Adjustment Market, JEPX wholesale market arbitrage, and the Capacity Market, with 10 MW+ systems eligible for the Long-term Decarbonization Power Source Auction; (3) a Green Transformation (GX) business that installs and operates on-site solar PPAs on idle corporate land and rooftops and provides technical guidance/licensing for overseas expansion of Japanese energy storage technology; and (4) VRFB system design consulting plus evaluation testing services. Customers span grid-scale BESS operators, industrial and commercial facilities seeking peak shaving and BCP backup, and critical infrastructure facilities (hospitals, government offices) where lithium-ion fire-safety regulations complicate deployment. Go-to-market is enterprise field sales with a consultative, solution-selling motion delivered through a package-solution ecosystem of partner companies covering land development, grid interconnection, materials, aggregation, and O&M. A multi-language (EN/JP/ZH) corporate website and direct inquiry forms serve as primary demand-generation channels; pricing is not publicly disclosed and is contact-based.

Name

LE System

Legal name

LE System Co., Ltd.

Website

https://lesys.jp

Company type

Private

Founded year

2023

Operating status

Operating

Headcount range

11–50 employees

Short description

LE System is Japan's only domestic manufacturer of vanadium redox flow battery (VRFB) electrolyte, recovering vanadium from industrial waste and selling electrolyte, grid-scale storage solutions, on-site solar PPAs, and VRFB consulting to grid operators, industrial facilities, and critical infrastructure customers.

Ownership category

akta.pro rank

Product category

Energy Storage Manufacturing (Vanadium Redox Flow Batteries)

NAICS

Battery Manufacturing (335910), Electrical Equipment Manufacturing (33531)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600), Instruments For Meas & Testing Of Electricity & Elec Signals (3825)

akta.pro primary industry

Battery Materials Refining & Re-Manufacturing Feedstocks (Li, Ni, Co, Mn, Graphite Salts) (EUAIAIAJ)

akta.pro secondary industries

Battery Modules & Packs (Industrial/Commercial pack assembly) (IMAGAHAB), Battery Recycling & Materials Recovery (Li-ion, LFP, Flow, Lead-Acid) (EUAMALAE)

Keywords

• Vanadium electrolyte manufacturing
• Redox flow batteries
• Grid energy storage
• Vanadium recovery technology
• Green transformation services

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. VRFB Electrolyte Manufacturing & Sales: Manufacturing and selling high-quality vanadium electrolyte for Vanadium Redox Flow Batteries. Electrolyte specifications can be adjusted according to customer requirements. As Japan's only domestic electrolyte manufacturer, the company supplies the heart of the VRFB system.
2. Grid Storage Solutions: End-to-end grid storage business covering site assessment, power environment evaluation, connection studies, land assessment, revenue modeling, and system implementation. Revenue generated through participation in three electricity markets: Demand-Supply Adjustment Market (ΔkW standby revenue + kWh discharge revenue), Wholesale Electricity Market JEPX (arbitrage trading), and Capacity Market (long-term kW supply capacity contracts). 10MW+ equipment eligible for Long-term Decarbonization Power Source Auction.
3. GX Business (Green Transformation Services): On-site PPA (Power Purchase Agreement) model for solar power generation systems on idle corporate land and facility rooftops. PPA operator installs, owns, and manages solar equipment; company purchases and self-consumes electricity on-site. Also includes technical guidance and licensing support for overseas expansion of Japanese energy storage technology.
4. VRFB System Consulting: Professional VRFB system design consulting providing customized energy storage solutions and technical support. Includes battery performance testing, basic component analysis, functional testing, and electrolyte performance evaluation.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

LE System manufactures and sells high-purity vanadium electrolyte for Vanadium Redox Flow Batteries (VRFB), recovering vanadium from industrial waste (electric precipitator ash) and converting it into 3.5-valent electrolyte through proprietary calcination and electrolytic reduction processes. The company supplements its electrolyte product with grid-scale battery energy storage system (BESS) solutions for participation in Japan's electricity markets, on-site solar PPA services for corporate decarbonization (GX), and VRFB system design consulting with proprietary evaluation technology. As Japan's only domestic VRFB electrolyte manufacturer, LE System supplies the core energy-storage component for both grid-scale and small/medium-sized (5kW x 4 hours) VRFB installations.

Product overview

LE System provides an integrated portfolio of vanadium redox flow battery (VRFB) solutions centered on electrolyte manufacturing and sales, complemented by grid storage services and GX (Green Transformation) business offerings. The core product is the VRFB electrolyte, which LE System manufactures as Japan's only domestic producer, recovering vanadium from industrial waste and converting it to high-quality electrolyte. The company's service ecosystem includes grid-scale battery energy storage solutions for power market participation, on-site solar PPA services for corporate decarbonization, and comprehensive VRFB system consulting with proprietary evaluation technology. The portfolio extends to small and medium-sized VRFB products targeting facilities with space or safety constraints, creating a vertically integrated offering from core component manufacturing through system integration and deployment.

Differentiator

Problem solved

Functional benefit

Products and services

• VRFB Electrolyte (Vanadium Redox Flow Battery Electrolyte)

Quantifiable outcome

• VRFB battery design life of approximately 20 years with semi-permanent electrolyte usability enabling cost reduction beyond 20 years
• +3 more outcomes

Segments4 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Ecosystem Partner CompaniescoreOthersLE System has built a robust ecosystem with partner companies that are 'top runners in their respective fields' covering land development, grid interconnection, material procurement, market operation (aggregation), and maintenance management (O&M). These partners provide execution capabilities while LE System serves as project hub and electrolyte manufacturer. No specific partner company names were disclosed in the source material.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Regional players

• GS Yuasa: Leading Japanese battery manufacturer with grid storage and industrial battery product lines. Comparable as a Japan-based battery manufacturer serving the energy storage market, though primarily focused on lead-acid and lithium-ion rather than flow batteries.
• NGK Insulators: Major Japanese manufacturer of NAS (sodium-sulfur) batteries for grid storage applications. Comparable as a Japan-based large-scale energy storage systems provider with established utility relationships, but uses a different battery chemistry.

Direct peers

• Rongke Power (Dalian Rongke Power Co., Ltd.): China-based VRFB manufacturer that has built some of the world's largest flow battery installations. Directly comparable as a vertically integrated VRFB player, though at much larger scale and focused on Chinese domestic and Belt-and-Road markets.
• Invinity Energy Systems: UK-listed pure-play vanadium flow battery manufacturer with commercial deployments in North America, Europe, and Australia. Comparable as a VRFB systems company selling into grid and microgrid applications, though Invinity focuses on stacks/systems rather than electrolyte manufacturing.
• CellCube (Enerox GmbH): Austrian/Canadian vanadium redox flow battery systems company with commercial installations globally. Comparable as a VRFB systems provider targeting commercial and industrial customers, though it sources electrolyte externally rather than manufacturing it.
• Sumitomo Electric Industries: Japanese industrial conglomerate with a long-standing VRFB development program and installed demonstration projects. Directly comparable as a Japan-based VRFB systems developer targeting grid storage, though it does not focus on electrolyte manufacturing and is a much larger diversified group.

Broad incumbents

• Fluence Energy: Global grid-scale energy storage integrator and lithium-ion battery system provider backed by Siemens and AES. Comparable as a major grid storage systems company bidding into capacity and ancillary services markets, but uses lithium-ion chemistry rather than VRFB.
• Tesla (Energy / Megapack): Global leader in lithium-ion grid storage via its Megapack product, with multi-GW deployment pipeline. Comparable as a grid-scale battery energy storage systems provider participating in capacity and ancillary services markets worldwide.

Emerging players

• ESS Inc. US-based flow battery company using iron-based electrolyte chemistry rather than vanadium. Comparable as a long-duration flow battery systems company targeting grid storage, though competing technology stack and geography differentiate it from LE System.

Others

• Largo Resources / Largo Clean Energy: Vertically integrated vanadium producer with a growing VRFB systems business (Largo Clean Energy). Comparable as a vanadium-to-VRFB integrated player, though based in the Americas and at a different stage of vertical integration.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights6 records

Customer concentration

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 LE System