Commonwealth Fusion Systems (CFS) has installed the first of 18 magnets for its Sparc fusion reactor, a key step toward launching the demonstration device next year. Each magnet, weighing 24 tons, can generate a magnetic field of 20 Tesla, confining plasma at temperatures exceeding 100 million degrees Celsius. CFS is collaborating with NVIDIA and Siemens to develop a digital twin model of the reactor, aiming to accelerate testing and optimization. The company has raised nearly $3 billion, with the goal of integrating fusion energy into the grid in the early 2030s.