steam is still very much used, nuclear reactors use it to transfer the heat from fission Coal plants also use steam for the same purpose. You may be referring to natural gas-powered plants which use a gas turbine instead. About 80% of all electric generation in the world is by use of steam turbines - http://en.wikipedia.org/wiki/Steam_turbine
Regardless, he`s talking about cogeneration from the "waste heat" usually dumped by electricity plants in the form of unused hot water. The system would have merit when deployed in small villages which have not yet been hooked to the electricity grid and which generate sufficent waste (e.g. animal/plant) to run a bio-gas facility, surplus power or gas from their bio-gas plant could be sold to the grid also. |
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