WUWT
"The biggest example is with combined heat and power (CHP), also known as cogeneration. Amazingly, this technology that many people have never heard of produces 9% of the world’s primary energy. Here in the States it produces 7% of our energy. But in countries like Finland and Denmark, it produces up to 40% of all energy.
CHP is the simplest idea in the world. A typical power plant producing electricity wastes about 65% of the fuel it burns. CHP plants capture the heat released and put it to good work, heating buildings or even cooling them with the right configuration. It takes the efficiency of the plant from 35% up to as much as 80% in some cases. The very first power plant built in America was a CHP plant, built in New York. Continuing in that tradition, New York’s Con Edison heats 100,000 buildings with district heating powered by CHP.
CHP gets little attention from environmentalists, because it is powered (mostly) by fossil fuels. Most new facilities use natural gas for fuel, but CHP is pretty agnostic about fuel. I say mostly because there are new CHP plants being fueled by wood pellets, which (Ta-da!) makes it renewable. ..."
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