As the world races to decarbonise, Japan is stepping on the accelerator. The country has made a bold promise to reach net-zero carbon emissions by 2050. So, it is changing how it powers homes, industries, and transportation. Japan used to depend a lot on fossil fuels and nuclear power. It is now excited to use solar panels, wind turbines, biomass, and marine renewables.
2025 is shaping up to be a landmark year in Japan’s renewable energy journey. With government support and strong innovation, the country is becoming a green tech hub in Asia. Investor trust is rising, too. This article looks at the top 10 renewable energy companies in Japan. They are changing the energy landscape and shaping the future.
1. JERA Co., Inc.
JERA, Japan’s top power generation company, is at the forefront of renewables. It excels in offshore wind and advanced solar technology. JERA is a major player in clean energy. It comes from a partnership between TEPCO and Chubu Electric Power. JERA is not only strong in Japan but also has a global impact.
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In 2025, all eyes are on JERA’s $5.8 billion partnership with BP. This project, known as JERA Nex BP, is groundbreaking. This initiative aims for an impressive 13 GW of offshore wind capacity. It is one of Asia’s most ambitious wind energy programs.
But JERA’s innovation doesn’t stop at the sea. Collaborating with SEKISUI CHEMICAL, it’s also pioneering ultra-light, flexible perovskite solar cells designed to fit on urban skyscrapers, stadiums, and infrastructure, helping Japan utilize every possible surface for energy generation.
Why It Matters: JERA isn’t just building turbines—it’s building the future. Its tech-driven strategy is tailor-made for Japan’s urban density and energy-hungry cities.
2. Eurus Energy Holdings Corporation
Eurus Energy is Japan’s largest wind energy developer. It’s a joint venture between Toyota Tsusho and TEPCO. Eurus has become well-known in the renewable energy sector. Eurus operates in Japan, Europe, and the U.S. This gives us a global view on local solutions.
In Hokkaido, the recently completed Dohoku Wind Power Project stands tall with six wind farms generating a combined 434.5 MW. Not far behind is the Ashikawa Wind Farm, Japan’s largest onshore wind installation, generating 128.8 MW.
Eurus is not just about building wind farms. It’s also about community. The company teams up with local governments. They create jobs, support environmental education, and revitalize rural areas. Their focus is on sustainable development.
Why It Matters: With Japan’s limited flat land, Eurus is proving that smart siting and community engagement are key to scalable renewable power.
3. RENOVA, Inc.
RENOVA, based in Tokyo, is one of Japan’s fastest-growing independent power producers (IPPs). They focus only on renewable energy. Its diverse portfolio includes solar, biomass, wind, geothermal, and hydroelectric power. This range is rare in an industry that often specializes by segment.
In 2023, Tokyo Gas bought a 13% stake in RENOVA. This move gave them new capital to grow their presence. The company is boosting its solar power and battery storage projects. This move fits well with Japan’s shift to decentralized energy systems.
RENOVA is expanding beyond Japan. They are starting new solar and biomass projects in Vietnam and Indonesia.
Why It Matters: RENOVA is flexible, diverse, and global—a model for today’s green energy firm.
4. Mitsubishi Corporation
Mitsubishi Corporation is a corporate juggernaut with a deep commitment to green energy. Mitsubishi won Japan’s first state-run offshore wind auctions in 2021. Now, it faces rising costs for construction and raw materials. It remains committed to its 1.76 GW offshore wind pipeline with strong determination.
Beyond wind, Mitsubishi is pouring resources into green hydrogen, ammonia, and carbon-neutral LNG, signaling a transition beyond just power generation to building entire ecosystems for a decarbonized future.
Why It Matters: Mitsubishi’s long-term vision makes it more than just a developer—it’s an architect of Japan’s entire green energy ecosystem.
5. Japan Renewable Energy Corporation (JRE)
JRE is all-in on renewables. With a portfolio that spans solar, wind, and biomass, the company operates over 40 power plants across Japan and Southeast Asia. As of 2025, it has a total installed capacity of 1.25 GW and more projects under construction.
JRE’s strength lies in meticulous site planning and environmental stewardship. It’s known for building projects that harmonize with nature and communities. One standout initiative is its environmental education programs tied to its renewable projects.
Why It Matters: JRE proves that renewables can be both powerful and peaceful, showing how sustainability and sensitivity can coexist.
6. Chubu Electric Power
Traditionally a utility heavyweight, Chubu Electric is now transforming into a global investor in green technology. With 400 billion yen ($2.7 billion) committed to overseas decarbonization assets by 2030, it has equity in Eneco (Netherlands), Eavor Technologies (Canada), and NuScale Power (U.S.).
In Japan, Chubu is using smart grid tech and digital tools. This helps add more renewable energy to the old power grid. It is exploring small modular reactors (SMRs) and carbon capture. This is part of a complete clean energy strategy.
Why It Matters: Chubu Electric combines traditional utility strength with new green ideas. This helps Japan stay in line with global energy trends.
7. Ichigo Inc.
Ichigo started as a real estate investment firm, but today it’s a green energy powerhouse. With over 60 solar and wind plants, Ichigo is unique in its approach: it integrates renewables into its broader sustainability vision that includes green buildings and eco-hotels.
Notably, Ichigo has developed the largest solar power plant in the Kanto region and continues to repurpose abandoned land and rooftops for solar development.
Why It Matters: Ichigo shows how companies outside the energy sector can still lead the renewable revolution by reimagining infrastructure through a sustainable lens.
8. Eco Marine Power
Operating from Fukuoka, Eco Marine Power is rethinking maritime transport through renewable energy. The Aquarius MRE system is a top product. It uses rigid sails, solar panels, batteries, and onboard computing. This setup helps create and manage clean energy for ships.
In 2025, Japan will launch the Tonbo HMP. This solar-powered ferry is designed for tourism. It represents a strong move towards clean shipping in the country’s busy waterways.
Why It Matters: Japan is an island nation with a vast maritime economy. Eco Marine Power is unlocking the seas as a new frontier for clean energy.
9. Amazon Japan
Yes, Amazon. The tech giant is now the largest corporate buyer of renewable energy in Japan. It has 25 renewable energy projects. These include 9 large solar and wind farms. There are also 16 rooftop solar installations at warehouses and data centres.
From 2023 to 2024, Amazon more than doubled its renewable capacity in Japan. It grew from 101 MW to 211 MW. This is part of its broader Climate Pledge to become net zero carbon by 2040.
Why It Matters: Amazon shows that big companies can help fight climate change. They can also boost the demand for renewable energy to a great extent.
10. SEKISUI CHEMICAL Co., Ltd.
SEKISUI CHEMICAL is a leader in materials science. They are creating buzz with their new flexible perovskite solar cells. These ultra-thin cells fit on uneven surfaces, such as curved walls and vehicles. Traditional panels often don’t work well in these cases.
The Japanese government is investing $1.5 billion in perovskite commercialization. They aim to match the output of 20 nuclear reactors by 2040. SEKISUI is at the helm of this mission.
Why It Matters: SEKISUI is changing the look of solar energy with its advanced materials.
Final Thoughts
Japan’s renewable energy change in 2025 goes beyond just large wind farms or sunny rooftops. It’s about a mosaic of innovation- across land, sea, and even the corporate world. The top 10 companies here are not just power producers. They include traditional utilities reinventing themselves and startups rethinking solar design. They are agents of change.
Japan is aiming for net-zero by 2050. These pioneers show us a future of energy that is decentralized and decarbonized. They are bold visionaries, ready to create a greener tomorrow.
