Best Energy Storage Tech Companies in Japan
The 39 best Energy Storage Tech companies in Japan in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: PowerX.
Our analysis of 50 Energy Storage Tech companies
$13.7b in tracked funding; 88% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy Storage Tech companies in Japan
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PowerX Manufacturer of stationary battery storage systems and related energy services | $91M | 18 mo ago | Public | Masahiro Ito Founder & CEO | 2021 | Cart FunctionalityContentfulTurbopack+23 | 41 patents Marine power transmission systems and moving-body energy generation technologies | 1 expansion |
| 2 | APB Manufacturer of lithium batteries | $74M | 68 mo ago | Series C | — | 2019 | — | 170 patents Lithium‑ion battery electrode materials and manufacturing processes/equipment. | — |
| 3 | Enax Lithium-ion battery manufacturers for industrial use | $41M | 192 mo ago | Late Stage | Masaki Saikusa CEO | 1996 | NginxjQueryMicrosoft 365+2 | 68 patents Advanced high‑energy secondary battery systems for aircraft and electric propulsion | — |
| 4 | Tsubame BHB Manufacturer of ammonia and its related products | $35M | 30 mo ago | Series C | Masahiro Watanabe Co-CEO | 2017 | WordPressMySQLPHP+15 | 37 patents Ammonia synthesis catalysts and production systems for efficient low‑temperature ammonia manufacturing | — |
| 5 | PLUGO Cloud-based EV charging solutions | $14M | 24 mo ago | Seed | Naoki Okawa Founder & CEO | 2018 | WordPressMySQLPHP+20 | 4 patents EV charging station usage, reservation, and predictive management systems | — |
| 6 | ELIIY Power Lithium based battery systems and ESS provider | $7M | 170 mo ago | Series A | Hiroichi Yoshida CEO | 2006 | RubyBootstrapRuby on Rails+18 | 227 patents Lithium‑ion battery positive electrode materials and advanced state‑of‑health/charging estimation | — |
| 7 | LE System Redox flow battery developer | $4M | 105 mo ago | Series A | Nagayoshi Ho CEO | 2011 | Apache HTTP ServerSwiperjQuery+2 | 79 patents Electromechanical actuators and fluid control systems for lighting and oral-care devices | — |
| 8 | Hydronext Developer of technology for purifying hydrogen from mixed gas states | $1M | 26 mo ago | Seed | — | 2015 | — | 3 patents Hydrogen separation and purification technologies using membrane-based devices. | — |
| 9 | Novars Provider of IoT based business consulting and services | $1M | 119 mo ago | Series A | Okabe Yoshihiro CEO | 2015 | WordPressMySQLPHP+21 | 43 patents Smart battery power supply devices with integrated wireless monitoring and management systems | — |
| 10 | AC Biode Developer of chemical and electronic technologies for plastic waste and energy | $172K | 23 mo ago | Seed | Tadashi Kubo CEO | 2018 | — | 4 patents Synthetic mineral synthesis processes for industrial and agricultural applications | — |
Top 12 Energy Storage Tech companies in Japan
#1
Public · Minato, Tokyo · founded 2021 · 47 employees$91.1Mraised▾
Manufacturer of stationary battery storage systems and related energy services. The company provides large-scale stationary battery solutions and related services. These offerings include battery storage systems, energy services, and charging solutions. The company is also involved in energy-related projects. It develops and deploys grid-connected energy storage solutions for power companies, real estate developers, and logistics firms.
- Mar 2025Series C$21.4M
- Sep 2024Series C$17.3M
- Jan 2024Conventional Debt$64.1M
- Jul 2023Series B$13.3M
#2
Series C · Yokohama, Kanagawa Prefecture · founded 2017$35.3Mraised▾
Manufacturer of ammonia and its related products
- Feb 2024Series C$35.3M
- Jul 2022Conventional Debt—
#3
Seed · Shinagawa, Tokyo · founded 2018 · 13 employees$14.1Mraised▾
Cloud-based EV charging solutions. It offers an EV charging station and charging products for electric vehicles.
- Aug 2024Seed$14.1M
#4
Series C · Tokyo, Tokyo · founded 2019 · 20 employees$74.3Mraised▾
APB is a manufacturer of lithium batteries. It offers lithium-ion batteries and all-polymer batteries for consumer, automotive, and large scale energy storage solutions. It utilizes a polymer resin and a bipolar structure that enables the high energy density of the batteries.
- Dec 2020Series C—
- Aug 2020Series C—
- Jun 2020Series C—
- Mar 2020Series C$74.3M
#5
Seed · Oita, Oita · founded 2015 · 6 employees$1.4Mraised▾
Developer of technology for purifying hydrogen from mixed gas states. The company's technology uses vanadium metal membranes to extract hydrogen. This technology allows for the potential of high-purity hydrogen refinement. It develops hydrogen extraction devices suitable for research, laboratory use, and factory testing.
- Jun 2024Seed$1.4M
#6
Seed · Tokyo, Tokyo · founded 2018 · 5 employees$172.2Kraised▾
Developer of chemical and electronic technologies for plastic waste and energy. The company provides chemical catalysts for plastic depolymerization and pyrolysis systems converting waste to feedstock. It also develops air filters that capture carbon dioxide for glass production. Additionally, the company creates battery systems and materials for water and oil repellency.
- Sep 2024Grant (prize money)$213.7K
- Dec 2020Seed$172.2K
#7
Late Stage · Tokyo, Tokyo · founded 1996 · 90 employees$41.5Mraised▾
Enax is a manufacturer and seller of high-capacity, high-power lithium ion secondary batteries. The company is also in Lithium ion secondary battery development and prototyping contract order management. Apart from regular industrial use batteries, the company also delivers custom made batteries for specific purposes.
- Aug 2010PE$41.5M
#8
Series A · Tokyo, Tokyo · founded 2006 · 312 employees$6.9Mraised▾
ELIIY Power develops, manufactures, & markets lithium-ion batteries and power storage systems. It offers products such as electricity storage systems (domestic use), and stationary electricity storage systems (commercial & industrial usage). It also provides custom-built products including high-capacity energy storage systems and solutions for remote monitoring of storage systems.
- 2012Series A$6.9M
#9
Series A · Kurume, Fukuoka · founded 2011 · 37 employees$3.5Mraised▾
Le System is a developer of redox flow batteries. It uses energy storage systems for the frequency modulation of the grid, and peak power backup, for energy unit distribution. It primarily develops vanadium redox batteries. Also engages in research and development of technology for recovering vanadium from waste.
- Nov 2017Series A$3.5M
- 2014Seed—
#10
Series A · Chiyoda City, Tokyo · founded 2015$1.2Mraised▾
Developer of connected batteries designed to realize digital transformation in all types of businesses. The company offers batteries that can be installed into dry cell-powered products, enabling users to take control of the item using mobile via Bluetooth.
- Sep 2016Series A$1.2M
#11
Series A · Chiyoda City, Tokyo · founded 2012 · 5 employees—raised▾
Developer of CO2 emission-free energy technology using quantum hydrogen energy. The company focuses on creating clean and safe energy solutions. It develops heat modules applicable for industrial and residential uses. The technology integrates quantum condensed matter physics, quantum mechanics, nanomaterials science, and thermodynamics.
- Mar 2026Series A—
- Jan 2019Seed—
#12
Seed · Bunkyo, Tokyo · founded 2008 · 30 employees—raised▾
NExT provides solutions for electric vehicle battery management. It provides battery control technology for businesses and companies.
- Dec 2025Seed—
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Storage Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Grid Energy Storage is moving in Japan
A read on the academic research around Grid Energy Storage — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 945 Japan-affiliated papers.
- Korea University70
- The University of Tokyo64
- National Institute of Advanced Industrial Science and Technology55
- National Institute for Materials Science52
- Kyoto University51
- Electrode2→37
- Battery (electricity)9→40
- Electrochemistry6→34
- Anode4→28
- Electrolyte12→36
- Renewable energy9→107
- Battery (electricity)7→94
- Photovoltaic system3→68
- Power (physics)1→48
- Electrochemistry2→39
- Battery (electricity)1→20
- Renewable energy1→16
- Electrolyte2→14
- Nanotechnology4→12
- Electrochemistry1→7
Where energy storage is researched across Japan
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Who's filing energy storage patents in Japan
Japan energy storage patent filing is accelerating — 2,762 filings from 502 assignees (2016–2025), led by GS Yuasa INT, Sumitomo Electric Industries, Panasonic IP MAN; annual filings 196→248.
- GS Yuasa INT1009
- Sumitomo Electric Industries907
- Panasonic IP MAN122
- Honda121
- Showa Denko KK121
- KOBE Steel92
- Toyota55
- Toshiba KK55
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.