Japanese fusion energy startup Helical Fusion says it will begin preliminary power-on tests at its demonstration fusion reactor in 2027. The tests are intended as an early step toward building and proving key systems for Helical Fusion’s pilot plant.
The company is developing Helix HARUKA, described as Japan’s first integrated pilot reactor using the helical approach to nuclear fusion. In its statement, Helical Fusion frames the timeline as part of its broader efforts to move from reactor development toward commercial nuclear fusion energy. The reporting focuses on the specific milestone of the 2027 power-on tests and the reactor’s role as a demonstration and pilot platform, rather than on technical results or regulatory outcomes.
Across the available sources, the main agreement is the announced schedule and the identification of the reactor project (Helix HARUKA) as the platform that will undergo these power-on tests.
