The ancient dream of bottling a star inched closer to reality in a Hangzhou laboratory. In January 2025, China’s Experimental Advanced Superconducting Tokamak (EAST)—dubbed “artificial sun”—sustained a searing plasma of 100m degrees Celsius for 1,066 seconds (17.8 minutes), shattering its previous world record of 403 seconds. This “100m-degree, thousand-second” milestone is not just a laboratory curiosity. It represents humanity’s most convincing step toward harnessing nuclear fusion, the process powering stars, which promises clean, abundant energy from seawater-derived fuel.
Engineering the Impossible
EAST’s achievement lies in reconciling extremes. Within its doughnut-shaped chamber, hydrogen isotopes swirl at temperatures six times hotter than the sun’s core, caged by magnetic fields 100,000 times stronger than Earth’s. Yet mere meters away, superconducting coils bathed in liquid helium at -269°C channel electricity without resistance. Maintaining this precarious balance required mastering “five ultras”: ultrahigh vacuum, ultra stable currents, ultrapowerful magnets, ultralow temperatures, and ultraprecise plasma control. The 1,000+ second feat relies on homegrown innovations, including:
– Active cooling systems pumping supercritical helium at 30 m/s near the plasma edge.
– Ion cyclotron radio waves heating fuel to ignition temperatures.
– All-metal plasma-facing walls resisting relentless particle bombardment.
The Hybrid Gambit
While pure fusion remains distant, China is hedging its bets. In Jiangxi province, the “Spark-I” project—a hybrid fusion-fission reactor—aims to connect to the grid by 2030. By wrapping a compact fusion core (40 MW) in a subcritical fission blanket, it leverages fusion neutrons to “burn” nuclear waste while generating 100 MW of electricity. This sidesteps fusion’s knottiest problems: the need for continuous operation and scarce tritium fuel. If successful, Spark-I could deliver the world’s first fusion-derived power—albeit impurely—years ahead of Western rivals like Helion Energy (targeting 2028).
The Commercial Horizon
Fusion’s ultimate test is economics. Today’s records remain scientifically profound but energetically costly: EAST consumes more power than it yields. For viability, reactors must achieve Q > 10 (10 times more energy out than in). The timetable requires patience:
– 2026–2030: Experimental reactors like BEST (Hefei) target net energy gain.
– 2035: China’s CFETR demonstration reactor aims for sustained power output.
– 2050: Projected commercial plant deployment if material and fuel challenges are resolved.
Private capital is accelerating the timeline. Firms like Shanghai’s Energy Singularity (which built a record 21.7-tesla magnet in 2025) and state-backed ventures such as China Fusion Company (launched July 2025 with $1.7B) are bridging lab-scale physics and engineering pragmatism.
The Verdict: EAST’s 1,066-second burn is a triumph of persistence. Yet fusion energy remains a marathon, not a sprint. As one Chinese scientist remarked: “This is not the end, but a new starting point.” The finish line—a world powered by starlight on Earth—may still be decades away, but the race is now on.