Helix HARUKA is Helical Fusion's integrated demonstration device under construction at NIFS in Toki, Gifu, to test HTS magnets and blanket technology for its heliotron (helical stellarator) concept. It precedes Helix KANATA, a planned net-electricity plant; Helical Fusion has raised about JPY 13.15 billion including grants and loans.
New to fusion? Nuclear fusion, explained: three ways to bottle a star
Current state
| Status | Under construction |
| Country | Japan |
| Location | National Institute for Fusion Science campus, Toki, Gifu |
| Developer | Helical Fusion |
| Developer type | Private |
| Concept | Stellarator |
| Fuel | D-T |
| Purpose | Demonstration |
| Site | Under construction at NIFS campus, Toki City |
| Private funding raised | JPY 13.2bn (as of 2026-10-08) |
Notes
concept "Stellarator" covers Helical Fusion's heliotron (LHD-derived) design. private funding raised includes grants and loans. April 2026 tranche from Fusion Energy Base listing (secondary). Commercial power targeted in the 2030s via Helix KANATA.
Timeline
- 2026-04-28 — Helical Fusion closed a Series B first tranche of about $16.9 million. (source)
- 2026-10-08 — Helical Fusion's Series B second close raised JPY 3.23 billion with Fuji Electric joining as strategic investor, taking cumulative funding to about JPY 13.15 billion. (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
NNN coverage
About Helical Fusion
Related projects
- Alpha (Proxima Fusion) Design · Germany
- Eos (Thea Energy) Design · United States
- FAST (Fusion by Advanced Superconducting Tokamak) Design · Japan
- GIGA (Gauss Fusion) Design · Germany
- Infinity One (Type One Energy) Licensing · United States
- Infinity Two (Type One Energy / TVA) Licensing · United States
- JT-60SA Operating · Japan
- Stellaris (Proxima Fusion) Design · Germany
See all 51 projects in the Fusion Energy Companies & Projects Tracker →
Sources
- Fuji Electric Joins Helical Fusion as Strategic Investor and Official Partner as Series B Second Close Raises JPY 3.23 Billion — Business Wire via Yahoo Finance (primary), checked 2026-10-11
- Helical Fusion completes critical components for Helix HARUKA — Helical Fusion (primary), checked 2026-10-11
- Helical Fusion — Fusion Energy Base, checked 2026-10-11