**Japan’s Fusion Energy Startup to Begin Power-On Tests at Pilot Reactor in 2027**
Japanese startup Helical Fusion has announced plans to commence preliminary power-on tests at its demonstration fusion reactor, Helix HARUKA, in 2027. This initiative marks a significant step towards the company’s ambition to establish itself as a leader in the commercial nuclear fusion energy sector.
Helical HARUKA is notable for being Japan's first integrated pilot reactor that employs a helical approach to nuclear fusion. The facility is designed to validate the feasibility of stable and continuous fusion reactions, a process that mimics the sun's method of generating energy by fusing atoms at extremely high temperatures. If successful, fusion energy has the potential to provide vast amounts of clean power while producing minimal radioactive waste, presenting a stark contrast to conventional fission reactors currently in use.
Despite decades of research—over 70 years—efforts to harness fusion energy have yet to result in a commercially viable reactor. Helical Fusion has made significant progress recently, having completed a performance test of a high-temperature superconducting (HTS) coil in 2025. This achievement involved replicating the magnetic environment required for fusion and establishing a stable current flow under superconducting conditions, a milestone that has been deemed a world first. The success of this test has cleared a crucial hurdle for the manufacturing and construction of the integrated demonstration reactor.
Construction of the first spiral coil at the National Institute for Fusion Science (NIFS) site in Toki, central Japan, began earlier this year and is now largely complete. This progress has allowed the company to open the facility to media coverage, showcasing its advancements in fusion technology. Following the initial power-on tests, Helical Fusion plans to install a second coil and additional major components, including a liquid-metal wall blanket, with the aim of conducting comprehensive power-on tests of the fully integrated facility around 2030.
Looking ahead, Helical Fusion intends to follow up the HARUKA project with HELIX KANATA, a larger reactor designed to achieve a net power output of 50 megawatts (MW). The goal for HELIX KANATA is to demonstrate stable and continuous power generation. The company plans to initiate full-scale investment in this project during the 2030s.
Helical Fusion is uniquely positioned as the sole private-sector inheritor of the helical fusion technology developed by NIFS, one of the largest fusion research facilities globally. The company’s long-term vision includes the development of the world’s first commercially viable fusion power plant based on this innovative helical design. CEO Takaya Taguchi has expressed optimism about the timeline, stating that the company aims to build a commercial power plant as early as the 2040s. However, he acknowledged that several challenges remain, including technical obstacles, cost considerations, safety protocols, and construction timelines.
The Japanese government is actively supporting the nuclear fusion industry, with Prime Minister Sanae Takaichi being a prominent advocate. The government has identified fusion energy as one of 17 strategic sectors and plans to invest approximately 3.1 trillion yen (about $19.7 billion) through a combination of public and private sector funding by the end of the 2040 financial year.
As Helical Fusion prepares for its upcoming tests and projects, the global community will be watching closely, hopeful that advancements in fusion technology could lead to a new era of clean energy production.