HH70 is the world's first fully high-temperature superconductor tokamak, developed and operated by Energy Singularity. It achieved first plasma in June 2024 and later demonstrated 1,337-second steady-state operation.
Operational. First all-HTS tokamak to achieve sustained plasma; set record with 1,337-second discharge.
Updated Feb 2026Checked 10 Oct0 updates this week
HTS materials maintain zero resistance at ~77 K (liquid nitrogen). This reduces cooling costs versus conventional superconductors needing 4 K liquid helium.
Stronger magnets confine plasma in smaller space, reducing device size and cost versus conventional tokamaks.
Long-duration discharges like HH70's 1,337-second operation demonstrate control needed for commercial fusion reactors versus pulsed operation.
| Spec | HH70 (All-HTS Tokamak) |
|---|---|
| HH70 toroidal magnetic field | 0.6 TeslaR (reported) |
| HH70 plasma major radius | 0.75 metersR (reported) |
| HH70 plasma duration record | 1,337 secondsR (reported) |
| HH170 center magnetic field (planned) | 10 TeslaR (reported) |
| HH170 major radius (planned) | 150 cmR (reported) |
| HTS magnet field record | 26.7 TeslaR (reported) |
R reported by the company
| Spec | HH70 (All-HTS Tokamak) | Energy Singularity HH170 (HTS Tokamak, Q>2 Target) |
|---|---|---|
| HH170 center magnetic field (planned) | 10 TeslaR (reported) | 10 TeslaR (reported) |
| HH170 major radius (planned) | 150 cmR (reported) | 150 cmR (reported) |
R reported by the company
Energy Singularity
HTS tokamak, compact fusion, high-temperature superconductor
Energy Singularity develops high-field compact tokamaks using HTS magnets. HH70 achieved first plasma in June 2024 as the world's first all-HTS tokamak. HH170 targets Q>2 fusion gain by 2027 with 10T center field.
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