Whether fusion is expensive depends on the reactor design. There are a lot of possibilities. On one end of the scale is ITER, the giant tokamak they're buildin

Whether fusion is expensive depends on the reactor design. There are a lot of possibilities. On one end of the scale is ITER, the giant tokamak they're building in France for tens of billions of dollars. At the other end is the petawatt laser boron fusion idea being pursued by HB11 Energy and various other researchers around the world. The main expense would be the laser at tens of millions of dollars.