Best Solar Energy Companies in Japan
The 52 best Solar Energy companies in Japan in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Shizen Energy.
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Our analysis of 100 Solar Energy companies
$30.5b in tracked funding; 83% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Solar Energy companies in Japan
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Shizen Energy Developer of solar & wind energy projects | $474M | 45 mo ago | Series D | — | 2011 | WordPressApple iCloud MailMySQL+12 | — | 1 job opening · 2 awards |
| 2 | Asuene Developer of solar energy projects | $69M | 25 mo ago | Series C | Keihiro Iwata Co-Founder | 2019 | — | 3 patents Software platforms for greenhouse gas emissions monitoring and management | — |
| 3 | Sharing Energy Manufacturer of PV and energy storage system | $27M | 3 mo ago | Series C | Kazuyuki Uemura CEO | 2018 | WordPressMySQLPHP+14 | — | — |
| 4 | Looop Distributed solar power plant developer | $26M | 72 mo ago | Series B | Soichro Nakamura Founder & CEO | 2011 | microCMSApple iCloud MailGoogle Workspace+17 | — | — |
| 5 | Sphelar Power Manufacturing and Designing of spherical shaped solar cells unlike flat panels | $18M | 171 mo ago | Series A | Souichiro Imoto CEO & President | 2012 | WordPressMySQLPHP+7 | 40 patents Integrated photovoltaic building components and semiconductor‑enhanced smart textiles. | — |
| 6 | Monochrome Developer of integrated rooftop solar energy systems and home energy management systems. | $13M | 3 mo ago | Series B | Yusuke Umeda CEO | 2021 | SentryNode.jsTypeScript+18 | — | — |
| 7 | Miraikikai Developer of robots and laser sensors for various industrial applications | $6M | 94 mo ago | Series A | Tohru Miyake Founder & CEO | 2004 | WordPressMySQLPHP+21 | 39 patents Autonomous robots for cleaning and maintaining solar panel installations. | — |
| 8 | Renova Developer of solar & wind energy projects | — | 27 mo ago | Acquired | — | 2000 | SentryApple iCloud MailGoogle Workspace+17 | — | 1 expansion |
Top 12 Solar Energy companies in Japan
#1
Series C · Minato City, Tokyo · founded 2018 · 50 employees$26.8Mraised▾
Manufacturer of PV and energy storage system
- Apr 2026Series C$5.4M
- Dec 2025Conventional Debt—
- Aug 2025Series C$21.4M
- Jan 2018Seed—
#2
Series B · Bakurocho, Ishikawa · founded 2021$12.7Mraised▾
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- Apr 2026Series B$12.7M
#3
Series C · Shinagawa, Tokyo · founded 2019$68.8Mraised▾
Developer of solar energy projects
- Jun 2024Series C$26.7M
- Mar 2023Series B$1.1M
#4
Series D · Fukuoka, Fukuoka · founded 2011 · 261 employees$473.7Mraised▾
Developer of solar & wind energy projects
- Oct 2022Series D$473.7M
#5
Series B · Tokyo, Tokyo · founded 2011 · 260 employees$26.3Mraised▾
Looop is in the business of development and sales, installation, construction, management and maintenance of distributed solar power plants. The company is focused in developing clean power using solar and other associated renewable energy sources
- Jun 2020Series B$26.3M
#6
Series A · Kyoto, Kyoto · founded 2012$18.4Mraised▾
Sphelar Power introduces a new technology called "Spherical Shaped Solar Cells", which is unlike regular flat solar panels. So far, it has developed two new products called "Sphelar BIPV", and "Sphelar EIPV Series". Basically, both products work on same principle as that of the solar panel except for the shape. They are designed in spherical shape which increases the surface area for capturing radiant energy from the sun to harness and thereby increasing the efficiency of the product. Sphelar BIPV series is similar to transparent glass window which allows light to pass through and generating electricity simultaneously. Both sides of this window capture light and generate power. Similarly, Sphelar EIPV series products are spherical Photovoltaic cells used in electric integration and in sensors. A wide range of products has been introduced in this series like Sphelar Array F12, Sphelar Dome, Sphelar Mini Dome, Sphelar One. Also, the company aims in producing new products based on this technology like Sphelar Garden Light, Sphelar Latern, Sphelar Stick.
- Apr 2012Series A$18.4M
#7
Series A · Takamatsu, Kagawa · founded 2004 · 24 employees$6.3Mraised▾
Developer of robots and laser sensors for various industrial applications. The company provides robots for solar panel cleaning, construction site layout, and livestock management. These robots offer solutions for challenging environments and repetitive tasks. The company's core technologies focus on robustness, agility, and autonomous operation.
- Aug 2018Series A$6.3M
#8
Acquired · Chuo City, Tokyo · founded 2000 · 291 employees—raised▾
Developer of solar & wind energy projects
- Apr 2024Post IPO—
#9
Funding Raised · Shibuya, Tokyo · founded 1927 · 14 employees—raised▾
EKO Instruments is a Japanese company that specializes in solar energy sensors, environmental science, and material analysis. They offer a range of high precision instruments such as pyranometers, solar monitoring stations, spectroradiometers, and thermal analysis instruments. EKO Instruments is also the only solar sensor manufacturer in the world that owns and operates its own PV plants.
#10
Seed · Tokyo, Tokyo—raised▾
Producer of renewable based solar energy to generate electricity
#11
Series A · Tokyo, Tokyo · founded 2007—raised▾
Smart solar is a Tokyo based solar power project developer which provides EPC (Engineering, Procurement, and Construction) services and operation and maintenance services. Project portfolio includes 2MW solar power project in Kochi Prefecture, 2 MW x 1.75 MW solar power plant in Kyoto Prefecture, Tango City, and 2.3 MW solar power plant in Tsukubamirai, Ibaraki.
- Nov 2017Series A—
- 2013Seed—
#12
Acquired · Minato City, Tokyo · founded 2012 · 382 employees—raised▾
Provider of EPC services for renewable energy
- Oct 2017Series A—
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Solar Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Solar Photovoltaics is moving in Japan
A read on the academic research around Solar Photovoltaics — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 1,255 Japan-affiliated papers.
- The University of Tokyo121
- National Institute of Advanced Industrial Science and Technology114
- Korea University103
- Kyoto University65
- National Institute for Materials Science61
- Photovoltaic system4→53
- Solar cell25→61
- Optoelectronics16→46
- Solar energy2→32
- Perovskite (structure)15→35
- Photovoltaic system13→146
- Solar cell26→126
- Solar energy6→97
- Optoelectronics26→99
- Renewable energy4→73
- Photovoltaic system6→34
- Solar energy2→29
- Renewable energy2→20
- Solar cell5→20
- Optoelectronics2→14
Where solar pv 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 solar pv patents in Japan
Japan solar pv patent filing is cooling — 25,053 filings from 8,000 assignees (2016–2025), led by Semiconductor Energy LAB, Sharp KK, Fujifilm; annual filings 3609→1109.
- Semiconductor Energy LAB2632
- Sharp KK2361
- Fujifilm1947
- SONY1930
- Sanyo Electric1872
- Panasonic IP MAN1733
- Sumitomo Chemical1471
- Toshiba KK1354
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.