As I recall the problem with fusion energy generation is that, with the present technology, it takes more energy to run the machine than it can generate via heat and steam turbines.
The fusion they can do. They just need better efficiency. The energy generated by the fusion process must be able to be fed back to the generator and leave something left over for the rest of us. That is, it needs to be self-sustaining and provide a usable and affordable output to the power grid.
And fusion is not fission. Fusion is what goes on in the sun. Fission is what goes on in atomic bombs. Big difference.
I thought they broke even a few years ago. (As much energy was generated as was fed into the process.) Also I thought the problem continues to be magnetic containment. They still can’t maintain the field properly to keep the reaction going.
My knowledge of this is very old.