What are the latest breakthroughs in fusion energy?

In January 2026, China's Experimental Advanced Superconducting Tokamak (EAST), also known as the "artificial sun," achieved a significant milestone by sustaining stable plasma beyond the Greenwald Limit—a density barrier in fusion research. Researchers at EAST managed to maintain plasma densities 1.3 to 1.65 times higher than this limit by finely tuning initial fuel pressure and applying targeted microwave heating. This stability enabled the creation of a theoretical "density-free regime," where plasma remains stable as density increases—a key advance based on the plasma-wall self-organization (PWSO) theory 1.

In July 2025, Helion Energy, a fusion startup based in Everett, Washington, began construction of a fusion power plant intended to supply energy to Microsoft data centers. This plant is expected to generate power by 2028, marking a significant step toward commercializing fusion energy for large-scale applications 2.

In January 2026, Commonwealth Fusion Systems (CFS) announced a collaboration with Nvidia and Siemens to expedite the development of fusion energy using advanced AI technologies. By creating a "digital twin" of its fusion demonstration machine, this partnership aims to significantly reduce the time required for scientific breakthroughs in fusion energy development 3.

Additionally, in October 2025, scientists at the UK Atomic Energy Authority (UKAEA) achieved a breakthrough by using magnetic coils to stabilize unstable fusion plasma for the first time in their type of machine. This achievement could be a crucial step toward making fusion power plants a reality 4.

These developments reflect the global momentum in fusion energy research, with both public and private sectors investing heavily to overcome technical challenges and move closer to realizing fusion as a viable and sustainable energy source 5.