The dream of limitless clean energy from nuclear fusion might be killed by a massive shortage of a specific type of lithium.
Fusion reactors need a specific isotope called Lithium-6 to breed the tritium fuel they consume. Current global supply chains are nowhere near capable of producing the tons of enriched lithium required for a commercial fleet. The cost and complexity of building these enrichment plants could make fusion more expensive than almost any other energy source. While we are winning the battle of plasma physics, we are losing the battle of simple logistics. Without a massive breakthrough in isotope separation, fusion might stay in the lab forever. This discovery forces a serious reality check on our green energy transition plans.
Lithium enrichment threatens to curb fusion deployment
arXiv · 2605.04707
The impact of lithium isotopic enrichment on the global deployment of nuclear fusion energy is analysed. Lithium - the 6Li isotope in particular - is essentially one of two elemental fuels required by fusion reactors for tritium breeding. Whilst variable consumption of lithium is low enough to present negligible cost, it is instead the large stored inventory volume (50-100 tonnes) and its required enrichment that compound to significantly drive capital costs. These costs are driven by the ineffi