China’s ‘Atomic Stitching’ Breakthrough Ushers in New Era of Ultra-Carbon Power
Chinese scientists have achieved a landmark breakthrough in energy technology with the completion of the world’s first fully commercial supercritical carbon dioxide (sCO₂) power generation facility, enabled by a revolutionary manufacturing process known as “atomic stitching.” The “Ultra-Carbon One” (超碳一号) project in Liupanshui, Guizhou Province, successfully synchronized its second 15 MW unit with the grid on May 30, 2026, completing a 30 MW demonstration facility that outperforms traditional steam turbines by a wide margin.
According to Xinhua News, the breakthrough represents 17 years of sustained research by the China Nuclear Power Research and Design Institute (NPIC), part of the China National Nuclear Corporation (CNNC). The first unit entered commercial operation on December 20, 2025, and has run stably for over five months.
What Is Supercritical CO₂ Power?
For nearly 200 years, steam-based power generation — essentially “boiling water” to drive turbines — has dominated global electricity production. Supercritical CO₂ technology offers a fundamentally different approach. Carbon dioxide is heated and pressurized above its critical point (31°C and 73 atmospheres), entering a supercritical state where it behaves as both a gas and a liquid simultaneously.
“In the supercritical state, carbon dioxide possesses both the high fluidity of a gas and the high density of a liquid,” explained Gong Houjun, a researcher at NPIC, as reported by Xinhua. “The high specific heat near the critical point makes compression losses low, perfectly matching the efficient operation requirements of thermodynamic cycles.”
The technology delivers dramatic improvements over conventional steam systems: power generation efficiency improved by over 85%, net power output increased by more than 50%, equipment footprint reduced by over 50%, and power ramp rate of 10% per minute — three times faster than traditional steam turbines. Operations staff requirements are cut to one-third.
The ‘Atomic Stitching’ Breakthrough
The core enabling innovation behind Ultra-Carbon One is vacuum diffusion welding (真空扩散焊接), described as “atomic stitching” (原子缝合术). This process bonds hundreds of alloy plates with micron-scale flow channels through atomic diffusion in a high-temperature vacuum environment, without any filler materials.
A large heat exchanger contains hundreds of thousands of microchannels. Even tiny deviations in temperature or pressure during welding can cause channel blockage, plate deformation, or uneven bonding, leading to complete equipment failure. For years, the US and UK maintained a monopoly on this critical manufacturing technology, imposing strict technology封锁 on China.
As Science and Technology Daily reported, the NPIC team started from zero — no equipment, no process, no experience — beginning with a 0.6-meter small welding device. After thousands of etching tests and hundreds of process parameter adjustments, they independently developed a full series of vacuum diffusion welding furnaces from 0.6m to 2.4m, completely breaking the foreign monopoly.
Global Race and China’s Leapfrog
The United States designated sCO₂ technology as its #2 national strategic frontier energy technology in 2015 and invested hundreds of millions of dollars in research. The Southwest Research Institute’s STEP facility achieved first sCO₂ power generation in June 2024 — at pilot scale. Japan, France, South Korea, Canada, and the Czech Republic all have active R&D programs.
China, however, is the first to achieve commercial operation at industrial scale. Chief Scientist Huang Yanping, chief designer of Ultra-Carbon One, told 21st Century Business Herald: “We are the only team in the world capable of achieving full-load, long-term stable and reliable operation of the unit. ‘Ultra-Carbon One’ is also the world’s first — the first team to industrialize and commercially operate it.”
China’s 14th Five-Year Plan for Energy Sector Science and Technology Innovation (2022) listed sCO₂ as a key frontier technology, and the breakthrough aligns with the country’s “Dual Carbon” goals of peaking emissions by 2030 and achieving carbon neutrality by 2060.
Environmental and Industrial Impact
If applied to all sinter waste heat recovery across China’s steel industry, the technology could save an estimated 4.83 million tons of standard coal and reduce CO₂ emissions by 12.85 million tons annually, according to expert calculations cited by Xinhua.
Beyond steel, sCO₂ technology has potential applications in solar thermal power, nuclear reactors (especially small modular reactors), marine and offshore platforms, data center waste heat recovery, and geothermal power. A demonstration project combining molten salt storage with sCO₂ generation is planned in Xinjiang.
Challenges and the Road Ahead
While the achievement is significant, challenges remain. Long-term reliability verification beyond the current five months of operation, standardization across different heat source scenarios, development of new maintenance protocols, and cost reduction through scaled manufacturing are all necessary next steps.
The team is already looking ahead. Gong Houjun told Xinhua that researchers are exploring AI integration for full-system simulation, using large language models and specialized industrial software for natural language-controlled intelligent simulation, real-time operational monitoring, fault prediction, and autonomous parameter optimization.
“Researchers must have lofty goals — to bring Chinese technology to the forefront of the world. This is a belief, and it is a responsibility,” Gong Houjun said.
What to Watch
The completion of Ultra-Carbon One positions China at the forefront of a technology that could reshape global energy systems. With international competition intensifying, the next phase will focus on scaling up to higher power ratings, expanding to new applications, and driving down costs. The race to commercialize next-generation power generation has entered a new chapter — and China has drawn first blood.