500w
Usually between 0.75-50 Mega Watts (MW)
This generating system produce aobut 800 megawatts
Power is calculate by the formula P = IV (current x voltage); energy of course is power x time, so you have energy = IVt (currnt x voltage x time).
Nuclear energy produces about 75% of France's electrical power, and the U.S. makes about 15% of its electricity that way. Nuclear energy can provide electric power for entire cities.