The Scale Challenge: Can Fluxnium Turn Seawater Uranium Into a Practical Reality?
AI-generated image · US National Wire
The ocean holds enough fuel for 50,000 years, but the real battle is fought in the manufacturing costs of the polymer fibers used to extract it.
In the world of clean tech, theoretical abundance is a dime a dozen. The ocean contains over 4 billion metric tons of uranium—a reserve Jeff Green, founder and CEO of Fluxnium, describes as being a thousand times larger than all identified hard rock mines combined, as TechCrunch first reported. But for the U.S. nuclear industry, which aims to triple its plant capacity by 2050, the question isn't whether the uranium exists, but whether it can be harvested at a price that doesn't break the bank.
Currently, the industry is facing a squeeze. According to the U.S. Energy Information Administration, yellowcake prices have surged 75% over the last five years. Beyond the price tag, there is a geopolitical vulnerability; Green notes that the vast majority of the world's uranium supply originates from China, Russia, Kazakhstan, Uzbekistan, Namibia, and Niger. If projected demand continues to climb, Green warns that the U.S. is structurally short on fuel.
Fluxnium's approach is a bet on deployment efficiency. The company is utilizing chemistry licensed from U.S. Department of Energy national labs to create specialized polymer fibers that attract dissolved uranium. The process is conceptually simple: braided fibers are deployed from buoys in a manner similar to seaweed farming. After 30 to 60 days, the fibers are retrieved, the uranium is eluted and purified into yellowcake, and the fibers are reused.
However, the transition from lab to commercial viability is where the friction lies. TechCrunch reports that when this technology was first demonstrated at a national lab, the extraction cost exceeded $200 per pound—more than double the current price offered by Western suppliers. To bridge this gap, Fluxnium is focusing on the physical configuration of the fibers to increase surface area, thereby capturing more uranium per deployment.
From a pragmatic standpoint, the success of this venture depends entirely on driving costs out of the manufacturing and deployment phases. As Green told TechCrunch, the individual components of the process are not novel; the goal is to optimize the supply chain to make the process as low-cost as possible.
The company has already raised a $7 million seed round, with Congruent Ventures leading the investment alongside Active Impact Investments and Constellation Energy, but this financial backing is only the initial phase. The real metric of success will be whether Fluxnium can scale these fibers to a cost-per-kilogram that allows seawater uranium to compete with traditional terrestrial mining. If they can, they move the needle from a scientific curiosity to a strategic energy asset.