The longest-operating private fusion company, TAE Technologies has pursued field-reversed configuration plasmas for over two decades with the ultimate goal of burning proton-boron-11 fuel — a reaction that produces almost no neutrons.
TAE Technologies was founded in 1998 under the name Tri Alpha Energy by the late Norman Rostoker, a distinguished plasma physicist at the University of California, Irvine, along with Michl Binderbauer, who now serves as CEO. The company operated in relative secrecy for its first decade before becoming more public about its research in the 2010s.1
The name "Tri Alpha" referred to the three alpha particles (helium-4 nuclei) produced by the proton-boron-11 (p-11B) fusion reaction, which the company ultimately aims to harness. The company rebranded to TAE Technologies in 2017.
TAE uses a field-reversed configuration (FRC), a type of compact toroid in which the plasma itself generates the confining magnetic field through internal currents. FRCs are inherently compact and have favorable properties for certain fuel cycles, but historically suffered from instabilities that limited their lifetimes.
The company's long-term fuel target, p-11B, requires plasma temperatures roughly ten times higher than those needed for deuterium-tritium (D-T) fusion. This makes it one of the most technically ambitious fuel choices in the industry, but it offers the advantage of producing virtually no neutrons, which would greatly simplify reactor materials and waste handling.
TAE has been a notable pioneer in applying machine learning to plasma optimization. In collaboration with Google, the company developed the "Optometrist" algorithm, which uses human-guided optimization to tune hundreds of plasma parameters simultaneously, yielding measurable improvements in plasma performance.3
TAE has raised over $1.2 billion in total funding from investors including Google, Vulcan Capital, the Kuwait Investment Authority, Sumitomo Corporation, and others. The company has also developed commercial spin-off technologies in power management and cancer therapy (through subsidiary TAE Life Sciences, which applies accelerator-based boron neutron capture therapy).4
TAE has built a succession of increasingly capable FRC machines: C-2 (2008), C-2U (2015), and C-2W/Norman (2017). Each generation demonstrated significant improvements in plasma temperature, stability, and confinement time.
It is worth noting that while TAE's FRC stability results have been published and peer-reviewed, the feasibility of achieving the extreme temperatures required for p-11B fusion in a net-energy-producing device remains undemonstrated. Some physicists have expressed skepticism about whether p-11B can ever achieve energy gain in a magnetic confinement system due to bremsstrahlung radiation losses.5
TAE is the longest-running private fusion company and has consistently pushed the boundaries of FRC plasma physics. Its choice of an aneutronic fuel cycle, if achievable, would represent a transformative advance for fusion energy.