The UK Atomic Energy Authority (UKAEA) has announced that Commonwealth Fusion Systems (CFS) has become the first international company to join its flagship Lithium Breeding Tritium Innovation (LIBRTI) programme, marking a significant step forward in global fusion research.
The collaboration will focus on advancing tritium production, one of the biggest technical challenges facing commercial fusion power.
Through the partnership, UKAEA and CFS will develop and test technologies designed to enable future fusion power plants to generate their own supply of tritium fuel.
The agreement also strengthens international collaboration in fusion innovation, with CFS contributing to experiments at the new LIBRTI facility under construction at UKAEA’s Culham Campus.
The programme is intended to demonstrate net tritium production, a milestone considered essential for the long-term viability of fusion energy.
Commenting on the partnership, Amanda Quadling, Senior Responsible Officer, LIBRTI, said: “Welcoming CFS is a defining moment for LIBRTI. Their participation adds momentum to our own efforts and accelerates the global pathway to demonstrated fusion power plant-scale technology.”
Why tritium production is essential
Tritium is a radioactive form of hydrogen that serves as a key fuel ingredient in most planned fusion reactors. Since naturally occurring tritium is extremely limited, future power plants will need to produce it internally.
This process takes place inside the reactor’s breeding blanket, where high-energy neutrons generated during fusion interact with lithium atoms, converting them into tritium.
Successfully achieving reliable tritium production is widely regarded as one of the final technological hurdles on the path to commercial fusion energy.
The LIBRTI programme is designed to help developers refine these blanket systems and verify their performance under conditions representative of full-scale fusion machines.
LIBRTI aims to unlock commercial tritium production
LIBRTI is a £220m initiative backed by the UK government to accelerate technologies required for commercial fusion power. Its primary objective is to prove that future fusion reactors can breed enough tritium to sustain their own operation, reducing reliance on external fuel supplies.
Central to the programme is a first-of-its-kind experimental facility being developed at the Culham Campus. The project has recently secured a high-flux neutron source, enabling researchers to recreate the conditions found inside future fusion power plants.
This dedicated facility will allow industry partners to evaluate and validate breeding blanket technologies under realistic fusion environments before deployment in commercial reactors.
International collaboration supports fusion progress
Based in Devens, Massachusetts, CFS was founded in 2018 as a spin-out from the Massachusetts Institute of Technology (MIT) and has become the world’s best-funded private fusion company, raising more than $3bn in investment.
The company is currently constructing its SPARC fusion demonstration device and is targeting electricity generation from its first ARC fusion power plant in Virginia during the early 2030s.
As part of the collaboration, CFS and UKAEA will jointly design experimental campaigns, establish testing protocols and carry out research at the LIBRTI facility.
CFS will also manufacture the first test articles that will be used in the programme’s initial experiments, helping accelerate progress towards practical tritium production for future fusion power plants.
Heena Mutha, Director of Fuel Cycle and Blanket Technology at CFS added: “It’s an incredible moment for the fusion industry that we’re building the capability to investigate the performance of blankets in a fusion-relevant environment. We look forward to this collaboration with the UKAEA and LIBRTI.”
