4221 megawatt hours equals 15,195,600 megajoules.
Convert 4221 megawatt hours into joules, kilojoules, calories, newton meters, foot pounds, watt hours, kilowatt hours, mega electrons, etc...
Convert 15195600 megajoules into joules, kilojoules, calories, newton meters, foot pounds, watt hours, kilowatt hours, mega electrons, etc...