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Combined heat and power

An introduction to combined heat and power (CHP).

The conversion of primary fossil fuels, such as coal and gas, to electricity is a relatively inefficient process.  Each year, UK power stations typically reject more energy as waste heat than is consumed by the entire domestic sector.  The principle of Combined Heat and Power (CHP), also known as co-generation, is to recover and make beneficial use of this heat, significantly raising the overall efficiency of the conversion process.  The very best CHP schemes can achieve fuel conversion efficiencies of the order of 90%.