Akhenaten: Gaining energy or containing it? A nuclear bomb is fusion energy, as is the sun, and all the stars. The technical challenge is in controlling the energy output. Just as a lightening bolt contains large quantities of electricity, it is not of a generally useful kind. What Focus Fusion attempts to do is produce the energy in a pulsed fashion, and at a cyclic rate that can feed directly into the grid. Check out the Focus Fusion video on YouTube. Dr. Lerner takes us through the physics step by step, so even I can understand it.