What is the simultaneous production of electricity and heat? What place can have in the electricity industry?
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Simultaneous production of electricity and heat are saying CHP and is now growing
The generation of electric power at the expense of heat supplied at temperature Thot and discarded into the environment at temperature Tcold cannot be more efficient than the Carnot value 1 - Tcold/Thot and is typically much closer to the Curzon-Ahlborn value 1 - Thot/Tcold)^1/2. Therefore the remaining fraction of the supplied heat, at most Tcold/Thot but more typically Thot/Tcold)^1/2, can be used for space heating or warming greenhouses in winter, etc., without any reduction in electric-power generation. The fraction of input heat of at most 1 - Tcold/Thot, typically much closer to 1 - Thot/Tcold)^1/2, that is converted to electric power is of course ultimately dissipated as heat at the point of use, which also contributes to space heating in winter at no extra cost (although this is a disadvantage during hot summer weather).
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