Tritium may not be all that scarce (Canada’s CANDU reactors alone have produced kilograms of it over the years), but keeping a steady, reactor-grade supply is still a major engineering challenge.

In this conversation, Ian Castillo, Co-CEO of Fusion Fuel Cycles, details how the upcoming UNITY-2 testbed will demonstrate the world’s first integrated, commercially relevant fusion fuel cycle. Along the way, he explains why “tritium is the fuel” for today’s machines, how “the breeder really acts as a tritium multiplier,” and what it will take to close the fuel cycle gap between prototypes and commercial fusion power.

About the guest

Ian Castillo leads tritium systems at Fusion Fuel Cycles, where his team is building UNITY-2 to demonstrate the viability of a truly closed tritium loop. He began his career at Canadian Nuclear Laboratories, gaining foundational experience in nuclear technology.