The UK's STEP project uses a higher aspect ratio ('spherical tokamak') to reduce the required size of the machine. The initial investigations from MAST are enc

The UK's STEP project uses a higher aspect ratio ('spherical tokamak') to reduce the required size of the machine. The initial investigations from MAST are encouraging, but we'll see how it goes. Of course, this stuff will be ready for commercial use in like 2050 assuming everything goes to plan (which is rare unless it's really prioritised like the Manhattan Project, Apollo Missions etc.) So regardless, something will have to be done prior to then - either we find better energy storage solutions for renewables or we expedite the construction of replacement/new fission plants or both.