Oak Ridge National Laboratory has licensed a suite of cryogenic pellet fueling technologies to Type One Energy, handing the Tennessee-based stellarator start-up hardware and IP that address one of the toughest gaps in commercial fusion: continuously fueling a plasma with high-purity solid hydrogen at reactor-scale rates. The agreement was signed August 5 at the Nuclear Opportunities Workshop in Knoxville, covering four ORNL inventions across pellet extrusion, injection, pressure relief and recirculation.
Why Pellet Fueling Matters
Fusion reactors burning deuterium and tritium must be constantly refueled to replace ions consumed by the reaction and lost from the confining magnetic fields. Cryogenic pellet fueling forms solid hydrogen pellets just above absolute zero and fires them into the plasma core — a method proven more effective than gas puffing but historically limited by injector throughput. ORNL's licensed tech includes a tritium-compatible gas gun with real-time pellet-size control, a screw extruder for continuous production, a reusable pressure-relief valve rated for sub-20-kelvin service, and a closed-loop recirculation system that recycles excess extrusion back into pellet production to shrink tritium inventory.
Deepening The ORNL–Type One Partnership
The license builds on prior collaborations, including a jointly-run high-heat-flux test facility and Type One's participation in ORNL's Innovation Network for Fusion Energy (INFUSE) program. Type One Energy CSEO John Canik called high-repetition, high-reliability fueling "one of the most essential technologies for continuous generation of fusion power," while ORNL Director Stephen Streiffer said the deal moves fueling research "out of the lab and into application."
Momentum For US Fusion
The move comes as US fusion players raise record capital and inch toward pilot power plants. It follows Commonwealth Fusion Systems' $1 billion raise for SPARC and ARC and Helion's $465M Series G to power a Microsoft fusion deal. Type One Energy, founded in 2019 and venture-backed in 2023, is pursuing an optimised stellarator via its FusionDirect program.
Reporting based on coverage from ORNL, World Nuclear News, Nuclear Engineering International and Interesting Engineering.