Cogeneration plants are power stations that use a heat engine to generate electricity and useful heat simultaneously. It is a thermodynamically efficient process of extracting energy from fuel. All thermal power plants use a fuel to heat up water to create steam that powers steam turbines which powers generators. However, there is waste energy such as wasted steam, thermal energy, which usually gets emitted into the atmosphere via cooling tower. However, in a cogeneration facility, they use the wasted heat and steam to heat up water, and cool buildings. In iceland they use geothermal energy from geysers to heat up water in heat exchangers which gets piped to cities and towns. Types of cogeneration plants include gas turbine, gas engine, biofuel engine, combined cycle, steam turbine, nuclear, and Molten carbonate fuel cells.
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