Roll on one. [pause] "Roll on one" means I turn the generator up full. The lights go brighter in half the prison.
he says that and indeed ceiling lights in the building go brighter.
Which implies that the electric chair requires a generator that produces suitable voltage and also adds extra power required to sustain the peak power consumption of the chair. This part makes sense.
But the "lights go brighter" part implies that the generator is somehow connected to the mains in the prison. This makes no sense to me - connecting a high-voltage (more than a kilovolt) generator to 110 volts mains would cause electrical problems and would likely not give any advantage.
I couldn't find any evidence of such setups - electric chair powered by a generator connected in any way to the mains of the building. Do such setups exist?