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Constellation funds a seawater uranium process while the price per pound is still a lab number
Fluxnium has come out of stealth with $7 million and a Department of Energy licence to grow uranium-catching fibre in the ocean. What a pound costs is still the open question for anyone who buys reactor fuel.
The Product Desk · Product desk
What happened
- Braided polymer fibre is hung off buoys the way seaweed is farmed, left 30 to 60 days, then hauled ashore for the uranium to be extracted, leaving no toxic tailings and lines reusable several times.
- Founder Jeff Green said increasing the surface area of the fibre draws more uranium out of the water and has brought the cost below that demonstration level.
- The US plans to triple its nuclear plant capacity by 2050, a target TechCrunch reports could stall if operators cannot buy fuel at reasonable prices.
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Why it matters
- constraint The only measured cost in the public record is the lab figure, and Fluxnium has not published the improved number, so a utility that wants to hedge fuel cost has no price to put in a contract.
- decision Constellation's participation turns fuel sourcing into a venture position for fleet operators, who can either fund cost reduction at seed stage or keep buying pounds at whatever the mined market charges.
- exposure If seawater extraction ever prices out, a Western buyer's exposure moves off the mining jurisdictions Green lists and onto domestic capacity to manufacture and deploy polymer fibre at scale.
A fuel buyer cannot sign a seawater uranium contract this year. Constellation Energy, which operates the largest nuclear fleet in the US [6], took part in the $7 million seed anyway, alongside lead investor Congruent Ventures and Active Impact Investments [5].
The figure on the record comes from the national lab demonstration, where the process extracted uranium at more than $200 a pound, which TechCrunch reports is more than twice the price Western suppliers charge today [9]. Halve $200 and the Western reference sits under about $100 a pound, so at that demonstration the distance to close was more than $100 on every pound [11]. Jeff Green, Fluxnium's founder and CEO, said raising the surface area of the fibres pulls more uranium out of the water and brings the cost down [10]. Green did not give a cost figure for the improved fibre [23].
Green is direct about the ingredients. "None of the components of this process are anything novel. It's all been done in different ways," he told TechCrunch [15]. "Our job is to drive cost out of the supply chain, keep working through all the stages of the process to make it as low cost as possible" [16].
Most of the cost sits in manufacturing the fibre and deploying it in the ocean [12]. That makes this a manufacturing problem before it is a chemistry one, and the chemistry itself is licensed from the Department of Energy [7]. Green's second company, NanoH2O, was a desalination startup he launched in 2005 [19].
The ocean holds more than 4 billion metric tons of uranium, on the order of 50,000 years of fuel [3]. That figure answers whether the atoms are there. The cost per pound answers whether a plant can buy them, and the two get conflated in every abundance pitch.
A fuel buyer weighs price against supply jurisdiction. Mined uranium is cheaper and, in Green's account, concentrated: "If you're in the West, two-thirds, three-quarters of the world's uranium supply comes from Kazakhstan, Uzbekistan, Russia, Namibia, Niger, China. There's geopolitical risk" [17]. Seawater uranium would be domestic and, on the last published figure, dearer. A buyer signs when the premium it will pay for a domestic pound is larger than that gap, and yellowcake prices have risen 75% in five years, according to the US Energy Information Administration [2]. Green said the output goes to the same customers as mined material: "Then we sell that just as any other mine into the supply chain" [22].
What to watch
- Fluxnium's measured cost per pound after the surface-area change, and the scale it was measured at.
- Whether Constellation moves from seed investor to offtake customer, and at what contract price.
- EIA yellowcake prices: further rises close the gap Fluxnium has to cover from the other side.