Improving lifetime value of a fusion powerplant using a physics-based digital twin. Assystem is an international engineering and digital services group focused on low-carbon projects that accelerate the transition to clean energy. Assystem is committed to the development of decarbonized electricity (fusion energy, renewables and electricity grids) and clean hydrogen. The Assystem team wanted to leverage the expensive design models to create a digital twin by inputting the sensor data that was livestreamed from the plant, which helps engineers understand the plant's structural integrity and further optimize inspection and maintenance schedules.