Efficiency of electricity and heat production from conventional thermal plants, 1990 and 2004

Output from conventional thermal power stations consists of gross electricity generation and also of any heat sold to third parties (combined heat and power plants) by conventional thermal public utility power stations as well as autoproducer thermal power stations. Electricity production from conventional thermal power plants (this includes both public plants and autoproducers) is defined as the process of electricity production using combustible fuel sources (coal, natural gas, oil, waste or biomass) or existing heat sources (geothermal energy). The efficiency of electricity production is calculated as the ratio of electricity output to the total fuel input.