John Elling's Molten Salt Solutions raises $7M for enriched lithium

Why it matters

Fusion developers are spending heavily on reactors while a basic fuel-cycle input remains commercially unavailable in the US. Molten Salt Solutions is trying to build that supply before customer timelines outrun it.

John Elling, founder and CEO of Molten Salt Solutions, announced a $7 million seed round to move the Santa Fe nuclear-materials developer from laboratory validation toward pilot production, according to the August 31 announcement.

Elling has spent much of his career moving science out of Los Alamos National Laboratory and into commercial products. Before forming Molten Salt Solutions in 2018, he founded Acoustic Cytometry Systems, which licensed Los Alamos technology and was later acquired, and Mesa Biotech, the handheld DNA-testing developer acquired by Thermo Fisher Scientific. Elling holds a doctorate in analytical chemistry from the University of Wisconsin and an MBA from the University of New Mexico.

That background matters because Molten Salt Solutions is attempting another difficult laboratory-to-factory transition. Its target materials, enriched lithium-6 and lithium-7, are required by proposed fusion and advanced fission reactors, yet the United States has no commercial lithium-enrichment capability. Reactor developers can design magnets, plasma chambers and power systems years before a domestic supplier can deliver the specialized material needed inside them.

A $7 million pilot-production bet

Dolby Family Ventures led the oversubscribed financing. Vanedge Capital Partners, Alumni Ventures, Gaingels, True Ventures and Future Ventures participated.

Molten Salt Solutions said it will use the money to build pilot-scale production, hire technical and operations staff and fulfill what it describes as active customer agreements. The valuation and expected capacity of the pilot operation were not included in the funding announcement.

The new financing follows a $3 million round from True Ventures and Future Ventures on December 11th, 2024. Molten Salt Solutions called that financing a seed round at the time and labels it a pre-seed in the new announcement. The dollars are clearer than the stage labels: Molten Salt Solutions has now reported $10 million in equity financing and more than $5 million in grants.

Those grants supported the earlier technical work that the venture round must now turn into repeatable production. Molten Salt Solutions said its enrichment process was developed with National Science Foundation small-business funding and in collaboration with Los Alamos. A separate Department of Energy INFUSE project is supporting work with Los Alamos, the University of New Mexico and Element 3 Energy on specifications for fusion-grade lithium.

The material behind the reactor

Lithium-6 is used to breed tritium, a hydrogen isotope that serves as fuel in many proposed fusion systems. Lithium-7 is used in some molten-salt fission designs because it limits neutron absorption and unwanted tritium formation.

The supply problem sits upstream of the increasingly well-funded reactor developers. A 2025 fusion supply-chain report from the Special Competitive Studies Project rated enriched lithium as a high-risk constraint and found no commercial lithium-enrichment capability in the United States. The report distinguished that shortage from raw lithium availability: the difficult step is separating the isotopes to reactor specifications.

Molten Salt Solutions is developing high-speed counter-current chromatography, a liquid-liquid extraction process intended to complete many separation stages inside an integrated system. A patent application assigned to Molten Salt Solutions describes a composition and method for extracting metals, including lithium ions, in a high-speed counter-current chromatograph.

Molten Salt Solutions claims its platform is about 100 times as efficient as legacy enrichment methods. That figure remains a company assertion. Molten Salt Solutions has not published the pilot-scale throughput, cost or purity data needed to compare the process with competing approaches under commercial conditions.

Customer interest comes before volume

Elling has started assembling prospective demand on both sides of the nuclear market. On March 24th, Molten Salt Solutions announced supply frameworks with Type One Energy and Gauss Fusion. Those agreements contemplate kilogram-scale lithium deliveries for testing as early as 2027, with the possibility of much larger volumes as the reactor programs advance.

The wording matters. The Type One and Gauss agreements establish frameworks to explore future supply rather than quantified purchase commitments. They still give Molten Salt Solutions direct input from developers that must decide purity, form and volume requirements before ordering reactor-scale material.

Molten Salt Solutions added a fission customer on June 3rd through a commercial agreement with Fissionaire.

Other enrichment efforts are moving in parallel. Marathon Fusion reported lithium-isotope separation with a plasma centrifuge on August 27th. EnergyX launched a nuclear-materials program on January 22nd targeting enriched lithium-6 and high-purity lithium-7. The competing methods differ substantially, and none has established large-scale commercial economics in public data.

The $7 million round gives Elling capital to produce the evidence that matters next: consistent isotope purity, usable throughput and costs that reactor developers can absorb. He has already taken two Los Alamos-linked technologies through acquisition. Molten Salt Solutions presents a larger industrial test, with customer schedules and an undeveloped domestic supply chain setting the pace.