How Does Cyclops Charge His Beams?

Scott’s body absorbs ambient energy from around him—practically any kind of energy—and metabolizes it as the concussive energy released by his optic blasts. Although it’s not commonly come up, very early on it was established that Scott needs to regularly release a blast of energy in order to avoid building up too much surplus energy in his body. That said, the energy that powers his blasts is practically limitless due to his body’s absorption methods, but the great focus Scott requires to fire a blast means he can only sustain a singular beam for about 15 minutes before fatigue and a combination of the psionic field around his eyes (more on that later) dissipate the output.
This absorption ability has occasionally manifested in different ways in the comics; once, Scott took a direct lightning blast from Storm to supercharge his optic blast, although it caused him a great deal of pain in the process. But this absorption means…