Inertia Enterprises cuts nuclear fusion fuel pellet fabrication to hours to clear the path for commercial production

Nuclear fusion startup Inertia Enterprises has announced a method to accelerate fuel pellet fabrication, cutting the required time from several days to a matter of hours, in a step that clears one of ten major obstacles to its ambition of building the first commercial power plant. The company had raised 450 million dollars from investors to convert technologies developed at the US National Ignition Facility into a broadly viable industrial and commercial model.

The National Ignition Facility at Lawrence Livermore National Laboratory, with which the company maintains a public-private partnership, relies on producing a very limited number of fuel pellets each year at high cost, taking up to a week or more per pellet.The company seeks to move these pellets from laboratory prototypes to factory-scale mass production.To this end, the company recruited industrial engineers from technology firms including Apple to re-engineer the production process and replicate it at high throughput rates suited to continuous operations.

The fusion fuel in this system consists of a spherical diamond shell lined with a thin layer of frozen deuterium and tritium, containing a gaseous mixture of the two hydrogen isotopes inside. These pellets are placed inside gold cylinders known as hohlraums to convert laser energy into X-rays that compress the pellet until the atoms fuse and release energy. The sphericity and purity of the pellet are critical to successful ignition, as slight imperfections can disrupt the reaction, but the team, led by co-founder and chief scientist Annie Kritcher, who designed the first net-energy-gain fusion experiment at the national facility, succeeded in growing the crystals in thirty minutes and fabricating the pellet in two to three hours.

The company is betting on a fourfold increase in laser power compared to the National Ignition Facility system to give the process a wider engineering tolerance.Chief executive and co-founder Jeff Lawson explains that boosting the laser driver output gives the system sufficient margin to tolerate subtle pellet manufacturing flaws, making it easier to accelerate production lines to meet the operational demands of a commercial plant, which is expected to consume ten fuel pellets every second.

Shortening the fuel production timeline offers another critical advantage by reducing the tritium inventory stored on site, a radioactive isotope that requires strict handling standards and faces acute global supply shortages. According to figures published in Science, the global stockpile of tritium does not exceed roughly 25 kilograms, with prices reaching around 30,000 dollars per gram. Although the company plans to produce its own tritium downstream through fusion reactions, accelerating the production cycle reduces initial reliance on stockpiles, helping to shrink facility footprint and increase overall efficiency.