Top 5 Green Energy startups in Japan
Dec 04, 2025
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29
1
Funding: ¥23.9B
PowerX brings power transfer technology to life, allowing for greater usage of renewable energy sources. In particular it develops battery tanker.
PowerX brings power transfer technology to life, allowing for greater usage of renewable energy sources. In particular it develops battery tanker.
2
Funding: ¥22.3B
Kyoto Fusioneering is a research & development, design, and manufacture of parts related to fusion reactors.
Kyoto Fusioneering is a research & development, design, and manufacture of parts related to fusion reactors.
3
Funding: $35M
Helical Fusion is developing helical-type fusion reactor. Their helical design keeps incredibly hot ionized gas contained steadily by itself, eliminating the need for external electrical power and allowing operations to run longer than with rival technologies. The company has finished testing a superconducting magnet that could work on a commercial scale. This marks the first time a commercial-scale coil has operated successfully under such conditions. The company plans to construct demonstration equipment by the decade's end. During the 2030s, Helical Fusion aims to launch its first pilot facility operating continuously while generating more power than it uses.
Helical Fusion is developing helical-type fusion reactor. Their helical design keeps incredibly hot ionized gas contained steadily by itself, eliminating the need for external electrical power and allowing operations to run longer than with rival technologies. The company has finished testing a superconducting magnet that could work on a commercial scale. This marks the first time a commercial-scale coil has operated successfully under such conditions. The company plans to construct demonstration equipment by the decade's end. During the 2030s, Helical Fusion aims to launch its first pilot facility operating continuously while generating more power than it uses.
4
Funding: ¥4.5B
EX-Fusion develops the first commercial laser based nuclear fusion reactor for power generation.
EX-Fusion develops the first commercial laser based nuclear fusion reactor for power generation.
5
Funding: ¥2.9B
TRENDE is an online renewable energy retailer selling electricity to residential customers in Japan
TRENDE is an online renewable energy retailer selling electricity to residential customers in Japan
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