Cogeneration, also known as combined heat and power (CHP), can simultaneously produce heat and electricity from the same facility.

Electricity can be generated by:

  • Reciprocating engines that usually run on natural gas, and increasingly biogas.
  • Gas turbines (using technology similar to that of jet engines).
  • Steam turbines, which use the steam produced by (biomass/gas-fired) boilers, geothermal energy and recovered energy sources.

The vast majority of steam used in cogeneration comes from renewable energy and recovered energy sources. In all cases, the heat given off by electricity production is recovered and reused. Cogeneration aims to use that heat as hot water or steam to supply: