Best Energy Efficiency Tech Companies in Japan
The 35 best Energy Efficiency Tech companies in Japan in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: JOLED.
Our analysis of 50 Energy Efficiency Tech companies
$7.8b in tracked funding; 86% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy Efficiency Tech companies in Japan
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | JOLED Developer of OLED-based display panels including printed OLED, oxide TFT displays, and flexible displays | $1.4B | 75 mo ago | Late Stage | Yoshimasa Ishibashi CEO | 2015 | — | 1,551 patents Flexible OLED display panels and manufacturing processes for foldable/rollable devices. | — |
| 2 | Kyulux Provider of OLED lighting systems | $86M | 4 mo ago | Series B | Akira Minakuchi Co-Founder & CFO | 2015 | WordPressApple iCloud MailGoogle Workspace+23 | 520 patents Organic light‑emitting diodes (OLEDs) and related emissive materials for displays and lighting | — |
| 3 | QD Laser Developer of nanotech-based quantum dots for energy generation | $50M | 89 mo ago | Public | — | 2006 | WordPressMySQLPHP+11 | 196 patents Semiconductor laser modules for projection displays and ophthalmic imaging systems | — |
| 4 | I-Grid Provider of GX solutions, energy trading, and renewable energy platforms | $21M | 37 mo ago | Series B | Tomokazu Akita CEO | 2004 | WordPressMySQLPHP+21 | 12 patents Design and optimization of quantum algorithms, circuits, and cost functions for quantum computing. | — |
| 5 | Skydisc Provider of digital transformation solution for manufacturing industries | $15M | 39 mo ago | Series C | — | 2013 | WordPressMySQLPHP+23 | — | — |
| 6 | SPACECOOL Manufacturer of optical film | $6M | 20 mo ago | Series A | — | 2021 | WordPressMySQLPHP+22 | — | — |
| 7 | U-MAP Technology solutions provider for energy insulation | $5M | 45 mo ago | Series B | Kenji Nishitani CEO | 2016 | — | 18 patents High‑thermal‑conductivity ceramic composites and resin fillers for power electronics cooling | — |
| 8 | RECEPTIONIST SaaS-driven visitor management and reception system for organizations | $1M | 102 mo ago | Series A | Mariko Hashimoto CEO | 2016 | WordPressMySQLPHP+27 | — | — |
| 9 | Habitat Offers visitor management solutions | $881K | 57 mo ago | Seed | Kawasaki Wataru Co-Founder | 2020 | — | — | — |
Top 11 Energy Efficiency Tech companies in Japan
#1
Series B · Fukuoka, Fukuoka · founded 2015 · 5 employees$85.7Mraised▾
Provider of OLED lighting systems. It offers TADF OLED (Thermally Activated Delayed Fluorescence Organic Light Emitting Diode) technology for display and lighting. The company offers hyper fluorescence OLEDs, which combine TADF and fluorescence emitters to enable highly efficient emission.
- May 2026Series B—
- Sep 2023Series B$1.4M
- Feb 2021Series B$34.3M
- May 2019Series B$31.8M
#2
Late Stage · Tokyo, Tokyo · founded 2015 · 590 employees$1.4Braised▾
Developer of OLED-based display panels including printed OLED, oxide TFT displays, and flexible displays. Offerings include display panels developed using technologies such as printed OLED, oxide TFT technology (TAOS), and flexible displays. The displays are claimed to have multiple features such as they are foldable, unbreakable, see-through, flexible, transparent, energy efficient, have better image quality and self-luminance, etc. Target markets include smartphones, wearable devices, medical equipment monitors, laptops, computers, etc.
- Jun 2020PE$280.6M
- Apr 2019PE$228.2M
- Aug 2018PE$425.6M
- Dec 2017PE$441.2M
#3
Series A · Minato City, Tokyo · founded 2021 · 20 employees$5.7Mraised▾
Manufacturer of optical film
- Jan 2025Series A$5.7M
#4
Series B · Chiyoda City, Tokyo · founded 2004 · 100 employees$21Mraised▾
Provider of GX solutions, energy trading, and renewable energy platforms. They offer solutions to accelerate decarbonization for regions and businesses. The company provides a platform for circulating renewable energy. It also shares information through its original media regarding carbon neutrality.
- Aug 2023Series B$21M
#5
Series C · Fukuoka, Fukuoka · founded 2013 · 10 employees$15.2Mraised▾
Provider of digital transformation solution for manufacturing industries. The product modules include AI analysis and IoT services, and in house package services. The features include automated production planning based on order information, standardizing and managing production planning tasks, visualizing progress and delivery scheduling, equipment allocation and management, and more.
- May 2023Conventional Debt—
- Apr 2019Series C$7.8M
- Oct 2017Series A$6.6M
- Jan 2016Seed$855K
#6
Public · Kawasaki, Kanagawa Prefecture · founded 2006 · 58 employees$50.4Mraised▾
Developer of nanotech-based quantum dots for energy generation. It provides quantum dot lasers, semiconductor optical devices, and amplifiers. The product line of the company includes distributed feedback lasers for precision machining, quantum dot lasers for optical communications, epitaxial wafer on GaAs substrate, visible laser sensors, and Fabry-Perot lasers. The company also offers smart eyewear based on Direct retinal projection which precisely controls the light to project images onto the retina.
- Apr 2019Series C$33M
- Oct 2018Series C—
- Dec 2010Series B$9.6M
- Feb 2009Series A$7.8M
#7
Series B · Nagoya, Aichi · founded 2016 · 5 employees$5.1Mraised▾
U-MAP is a technology solutions provider for energy insulation. Offers include an aluminum nitride(AlN)-based electrically insulating ceramic material. AlN whiskers (are filled with resin, rubber, adhesive, or oil) can control the heat path of electronic machines. Used for mobiles, computers, LED, power device modules, and others.
- Dec 2022Series B$5.1M
- Dec 2022Grant (prize money)—
#8
Seed · Minato, Tokyo · founded 2020$880.6Kraised▾
Offers visitor management solutions. The company offers an automated tool for managing entry and exit measurements for e-commerce stores, public baths, and sauna tubs. It also offers solutions for digitizing customer entries.
- Dec 2021Seed$880.6K
#9
Series A · Shibuya, Tokyo · founded 2016$1.1Mraised▾
SaaS-driven visitor management and reception system for organizations. Offers reservation management for the conference rooms, and schedule adjustment tools. It also provides a cloud reception, and reservation management systems.
- Mar 2018Series A$1.1M
#10
Series D · Tokyo, Tokyo · founded 2014 · 30 employees—raised▾
Developer of smart remote control systems for home appliances and EV. The company provides devices to automate and manage home appliances through a unified application. It offers products that allow users to monitor energy consumption and control EV charging. The company also provides solutions for optimizing energy usage.
- Jun 2024Series D—
- Feb 2024Seed—
#11
Series A · Tokyo, Tokyo · founded 2010—raised▾
Sassor is a service that allows small offices and restaurants to manage their electricity consumption easily. Saving electricity is important both environmentally and financially but unless we can measure the consumed electricity individually, the effectiveness of the attempt will always remain questionable. Their service visualizes the energy consumption of each appliance and promoting actions that conserve electricity.
- Dec 2013Series A—
- 2012Series A—
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Efficiency Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Energy Efficiency & Buildings is moving in Japan
A read on the academic research around Energy Efficiency & Buildings — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 1,005 Japan-affiliated papers.
- The University of Tokyo72
- Kyushu University62
- Waseda University59
- University of Yamanashi51
- Hokkaido University45
- Radiative cooling1→13
- Radiative transfer1→9
- Renewable energy2→10
- Passive cooling2→7
- Electric power system1→5
- Thermal comfort8→15
- Radiative cooling1→6
- Exergy3→8
- HVAC5→9
- Software deployment1→4
- Heat pump35
- Heat exchanger13
- Air conditioning7
- Nuclear engineering7
- Thermal7
Where energy efficiency 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 efficiency patents in Japan
Japan energy efficiency patent filing is cooling — 1,944 filings from 714 assignees (2016–2025), led by Mitsubishi Electric, Daikin IND, Denso; annual filings 275→120.
- Mitsubishi Electric1050
- Daikin IND458
- Denso161
- Panasonic IP MAN155
- Daikin Europe148
- Panasonic130
- Yanmar121
- Hitachi82
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.