Gas/Coal/Oil/etc. power plants have long captured heat from exhaust to produce additional power. They typically run the exhaust through a heat exchanger that h

Gas/Coal/Oil/etc. power plants have long captured heat from exhaust to produce additional power. They typically run the exhaust through a heat exchanger that heats water to run a steam turbine. It would be interesting to learn how this method's efficiency and cost compares for a large power plant, but it sounds like it might be practical for small power plants where traditional methods of capturing exhaust heat are uneconomical.