The Ratio of machine output and input. The efficiency is related... of a thermal power plant is the ratio of electricity generated to the heat generated. Due to physical laws, the Ratio of machine output and input. The efficiency is related... depends on the temperature of the process medium and amounts to about 34% for a Collective term for all H2O moderated and cooled reactors; S... and 40% for a modern coal-fired power plant. The majority of the generated heat in these thermal power plants is discharged to the environment via the condenser cooling water.