China Fusion Push: BEST Reactor Halfway Built, ENN Fuses Boron

Three announcements in one week

At the end of September and start of October, China's fusion program made three announcements within days of each other. On September 28, the Langfang-based ENN Group said its EXL-50U spherical tokamak had produced hydrogen-boron fusion reactions4. A few days later, state media reported two things about the Burning Plasma Experimental Superconducting Tokamak (BEST) in Hefei: its dedicated campus had been handed over ahead of schedule, and assembly of the main machine had entered its most delicate phase1213. Just before both, the Institute of Plasma Physics in Hefei said it had finished testing a 582-tonne superconducting magnet built for BEST6.

Taken together, these reports show a country moving fusion from laboratory physics into heavy engineering faster than most of its rivals. Neither the reports nor the experiments support the idea that a global energy shift is close. The momentum is real. The arrival date of fusion power is still an open question.

ENN's hydrogen-boron result

The ENN result stands out mainly because of the fuel. Most fusion programs, including ITER in France, burn deuterium and tritium. Tritium is scarce, radioactive and expensive, and the reaction releases high-energy neutrons that make reactor materials radioactive over time4. Hydrogen-boron fusion joins a proton to a boron-11 nucleus and produces helium nuclei without that neutron flux4. The US company TAE Technologies and Germany's Marvel Fusion are pursuing the same fuel5.

ENN says it did not try to heat the whole plasma to extreme temperatures. Instead, it combined neutral beam injection with radio-frequency waves to push a large share of protons toward the energy at which the reaction is most likely, known as the "first resonance peak." According to the company, those fast protons drove the reaction rate above 100 million per second49. ENN says more than ten outside experts reviewed the data and agreed that the measurements of alpha particles, the reaction's product, were valid and repeatable4.

The coverage agrees on these basic facts but varies in how carefully it frames them. Some outlets called the result a "world first"10. The company's own claim is narrower: this is the first time a commercial fusion company has produced the reaction on its own device49. Some reporting also notes, correctly, that 100 million reactions per second is nowhere near net energy. Hydrogen-boron fusion needs much harsher conditions than deuterium-tritium fusion, which is why most of the field treats it as a long-term option173. ENN's chief engineer, Yang Yuanming, said the team's next goal is a plasma temperature of 100 million degrees Celsius, so the device is not there yet4.

ENN's commercial timeline is ambitious. It broke ground on a successor platform, Helong-2, on September 15. Experiments there are planned to start by the end of 2027, with first electricity targeted for 2030 and a demonstration reactor stage before 203552. Coverage that included caveats described these dates as company goals rather than independent assessments5. That is the right way to read them.

BEST: assembly passes the halfway mark

The state-backed track is more conventional and probably more important in the near term. BEST is led by the Institute of Plasma Physics of the Chinese Academy of Sciences. It is meant to demonstrate a burning deuterium-tritium plasma, in which the fusion reactions themselves supply much of the heat that keeps the plasma going12. Main components, including the vacuum vessel, thermal shield and toroidal field magnets, have been arriving on site since July, and state broadcaster CCTV says overall assembly is more than half done12. The current "four-ring" stage fits these parts together from the inside out1213.

The main supporting hardware is substantial. The new magnet is described as 1.3 times larger than ITER's equivalent coils, with three times their energy storage6. BEST's design target is Q=5, meaning five times more fusion energy out than heating energy put in6. Officials say construction will finish by the end of 2027, followed by a demonstration of fusion electricity around 20301213.

The schedules do not fully match across reports. Most reporting gives end-2027 for completion1112, but one reference entry says the machine will be "largely completed by 2028"18. The goals are also described in different ways: some reports frame the 2030 milestone as net power gain plus electricity generation16, while others call it a feasibility test12. State outlets say BEST will produce fusion electricity "for the first time in history"1316. That claim is plausible. It is also a forecast, not a result. As one US outlet pointed out, no fusion device has yet delivered electricity to a grid5.

The physics behind the confidence

Part of what makes Hefei's timeline believable is the track record of its older machine, EAST. In January 2025, EAST held a 100-million-degree plasma for 1,066 seconds, a world record13. In January 2026, researchers published results in Science Advances showing EAST running stable plasmas at 1.3 to 1.65 times the Greenwald density limit, an empirical ceiling that has constrained tokamaks since 198827. Fusion power rises roughly with the square of density, so a higher ceiling matters for how much power a reactor can produce23.

The method is unusual. Rather than correcting instabilities once they appear, the team controlled plasma-wall interactions from the start of each discharge. They used microwave heating of electrons and a higher initial gas pressure so that fewer impurities came off the walls127. The result is the first experimental confirmation of a 2017 theory by French physicists23. Earlier machines had exceeded the Greenwald limit too: ASDEX Upgrade and DIII-D reached about 1.5 times the limit using pellet injection. EAST's contribution is the method and its theoretical basis, along with discharges of about six to seven seconds, compared with DIII-D's 2.2-second run at 20 percent above the limit in 202427.

Some coverage got the details wrong. One widely shared piece gave the density as 50 percent above the limit, then later said up to twice the limit, and attributed the result to mechanisms that do not appear in the published account2528. The figures most consistent with the paper are 1.3 to 1.65 times the limit2729. The tempered reading is also the better one. An expert quoted by The Chemical Engineer said the finding increases confidence in future reactor designs but does not speed up timelines and is not a shortcut to power-producing fusion23. The EAST team has not yet shown the regime in high-confinement mode, the conditions an actual reactor would need22.

A newer study points to a less comfortable issue. Researchers calculated that tungsten contamination of just one part in 10,000 could roughly double the plasma pressure needed for ignition. In three-dimensional models, that requirement could exceed the limits at which the plasma stays stable7. Tungsten lines the walls of EAST and more than a dozen next-generation machines729. If those calculations hold, impurity control becomes the main obstacle, and EAST's success in keeping walls clean at startup becomes more valuable than it first looked.

What the race actually looks like

The geopolitical side is already visible. On September 24, a bipartisan group in the US House introduced the American Leadership in Fusion Act, proposing $10 billion in federal fusion spending. The bill's backers presented it as a response to Chinese competition5. The bill has only been introduced, Congress is in recess until after the November midterms, and the industry groups endorsing it stand to benefit from its funding5. Meanwhile, ITER is not expected to begin full deuterium-tritium operations until well into the 2030s17. Commonwealth Fusion Systems' SPARC in the US is the closest Western equivalent to BEST. In 2025 it was aiming for net energy around 202719.

What sets China apart, judging by the reporting, is that it is funding two tracks at once. A state-led tokamak line runs from EAST to BEST and on to a planned engineering demonstration reactor6, while private firms like ENN test alternative fuels15. Plans for a dedicated "Fusion City" in Hefei's Changfeng County show how seriously the government is treating the industry16.

The verdict

The idea that fusion is "coming sooner than you think" holds up only if "sooner" means a credible fusion electricity demonstration around 2030, roughly ten years ahead of what ITER's schedule once suggested. China has a real chance of getting there first, and its recent progress has come from detailed engineering work rather than headline claims. A demonstration is still not a power plant, though. Tritium supply, materials that survive neutron damage, impurity control and plant economics all remain unsolved177. The global energy system will not change on a 2030 timescale. What could change by then is which country leads fusion technology.