MegawattMillion times the power unit of watt (W), symbol: MW. 1 MW =... electric; electric output of a power plant in megawattMillion times the power unit of watt (W), symbol: MW. 1 MW =.... The electric output of a power plant is equal to the thermal overall power multiplied by the efficiencyRatio of machine output and input. The efficiency is related... of the plant. The power plant efficiencyRatio of machine output and input. The efficiency is related... of light water reactors amounts to 33 to 35% compared to up to 40% for modern coal-, oil- or gas-fired power plants.