Assuming perfect efficiency in terms of adding energy to the velocity of an 80kg human payload, with zero other power usages, losses, etc, simply accellerating

Assuming perfect efficiency in terms of adding energy to the velocity of an 80kg human payload, with zero other power usages, losses, etc, simply accellerating a human up to and back down from that speed takes about 1.6*10^16 joules, or about half of the daily output of the worlds nuclear reactors, or the ENTIRE volume of the Hindenburg as a bladder full of gasoline and a magic machine to extract 100% of the energy.