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Combined Heat & Power Plants

Combined heat and power (CHP), also known as cogeneration, is an efficient, clean, and reliable approach to generating power and thermal energy from a single fuel source such as biomass.  CHP is the simultaneous production of two types of energy - heat and electricity. 
imageSource:  National CHP Roadmap, 2001
CHP is a form of "energy recycling." CHP systems consist of a number of individual components-prime mover, generator, heat recovery and electrical interconnection-configured into an integrated whole." Combined cycle gas turbines, internal combustion engines, combustion turbines, biomass gasification, geothermal, sterling engines as well as fuel cells are suitable for CHP.
imageSource:  National CHP Roadmap, 2001

In CHP systems, thermal energy in various exhaust streams from power generation equipment is recovered for operating equipment for space and/or process cooling, heating or controlling humidity in facilities, by using absorption chillers, desiccant dehumidifiers, or heat recovery equipment for producing steam or hot water. These integrated systems are known by a variety of acronyms: CHP, CHPB (Cooling, Heating and Power for Buildings), CCHP (Combined Cooling Heating and Power), BCHP (Buildings Cooling, Heating and Power), and IES (Integrated Energy Systems). Source:  TSTC, Jim Brazell, VentureRAMP
Just over 8 percent of world electricity generating capacity uses cogeneration, also known as combined heat and power (CHP)-an integrated energy system that produces both electricity and heat. Cogeneration plants have a total global installed electricity capacity of some 325,000 megawatts (MW). Source:  WorldWatch Institute Amanda Chiu

Phoenix Renewable Energy CHP facilities will utilize wood biomass fuel to generate process steam of 95,000 lbs/hour @ 57 psi for the adjacent pellet production facilities and 20MW/hour of power at maximum design to be sold to utility companies. 

Figure 1. CHP Expansion Helps Optimize Natural Gas Supplies and Infrastructure
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Source: Energy Information Administration in Progress of the CHP Industry in Removing Barriers to Implementation of CHP, Jimison, 2003.