Israeli startup nT-Tao fires first plasma in compact fusion reactor
nT-Tao says C3 reached first plasma in under three months, turning its compact fusion concept into hardware that can now be measured against density, heating and scaling targets.
The hardest part of compact fusion is not the concept slide, it is getting magnets, pulsed power and heating to produce a real plasma inside a machine that is supposed to stay small enough for practical deployment. nT-Tao says its C3 prototype has now crossed that line, reaching operational status and firing first plasma pulses in under three months.
The milestone, announced Jan. 15, 2026, matters because C3 is the point where the company’s pitch stops being a design claim and becomes testable hardware. nT-Tao says the system moved from assembly to plasma operation in roughly two months, a pace that suggests the integration stack, from proprietary heating to magnetic control, is working closely enough to begin real experiments.
C3 builds on the company’s earlier C2-A campaign, which nT-Tao says reached plasma temperatures of about one million degrees Celsius, or roughly 100 eV, at high density. The company’s longer-term target is not a lab novelty but a compact reactor that can produce 10 to 20 MW, with materials describing a 20 MWe on-site baseload concept for data centers, industrial sites, maritime use and remote infrastructure. nT-Tao describes the design as stellarator-based and says it relies on proprietary plasma heating, an innovative magnetic topology and pulsed-power control to make fusion smaller and simpler.
What first plasma does not prove is just as important. It does not show that C3 can sustain the densities, pulse repetition, control stability or component life needed for a commercially meaningful reactor. It does, however, give nT-Tao a platform to validate simulations against real data, and the company says that is exactly how C3 will be used before later prototypes are built.
The company’s progress has been backed by a growing funding base and an unusually compact team. Public profiles place nT-Tao’s founding in 2016, and reported total funding now stands at about $28 million, including a $22 million Series A led by Delek US and NextGear Ventures with participation from Honda, OurCrowd and the Grantham Foundation. The Israel Innovation Authority added support in March 2025, while Stewart C. Prager, the former director of the Princeton Plasma Physics Laboratory, joined the scientific advisory board to help interpret the model and experiment loop.
That is the real significance of C3’s first plasma. The reactor is still far from proving commercial power, but the machine is now doing the one thing every fusion program needs before anything else can be credibly claimed: making plasma on command, inside the hardware that is supposed to carry it the rest of the way.
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