A typical coal fired power plant, like the one in this picture, heats water to 540 deg C to produce high pressure steam. To produce 10 9 kWh/year of power, the plant burns 14,000 tons of coal every ... and thus approximately the calorific value of hard coal which, depending on the type, amounts to between 29.3 MJ/kg (gas-flame coal) and 33.5 MJ ...
