3.15 Mj = 0.875 kWh the unsolved issue with laser fusion (ICF) as an energy source is the fast degradation of high powered lasers. High powered beam degrades

3.15 Mj = 0.875 kWh the unsolved issue with laser fusion (ICF) as an energy source is the fast degradation of high powered lasers. High powered beam degrades optics on it's path and those things are expensive. ITER has similar problem with superconducting magnets.