Business Energy, Mar.-Apr. 2014, by Carol Brzozowski.

"Cogeneration and trigeneration: industry experts say the time is ripe—again—for the increased use of these technologies. Cogeneration, or combined heat and power (CHP), uses a heat engine or power station to generate electricity and heat for onsite uses. Trigeneration, or combined cooling, heat, and power (CCHP), is the simultaneous generation of electricity and useful heating and cooling as a result of the combustion of fuel or the action of a solar heat collector."