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Stirling Engines, not very popular, but really promising engines. Check out the features.
- Closed cylinder engine
- No Combustion and noise
- Works on heat exchange
- Any heat source can power the engine
- Most efficient of all engines
- Low Maintenance
- Most suitable for solar concentrators
This is a very simple but feasible and effcient technology, yet relatively untapped, why ? I can see only one reason. The Energy Lobby. Stirling engines will surely replace the concept of centralized power production. Every home will have its own energy source, a Stirling engine powered by either concentrated solar energy, waste wood, or even biogas from sewage.
The Germans have the technology, buy it from them, mass produce it cheaply in india, subsidize to promote like we do for inefficient solar cells, and we are self sufficient. 
I dream of having this on top of my house, my own powerhouse. A Solar concentrator and a Stirling engine. This is a 25KW station. Mine would be much smaller less than 5KW.
And Some interesting information - There was a company in Madras who manufactured 5KW Stirling engines for farmers. The fuel- wood, dried cow dung, and anything that burns and produces heat.
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Review on — May 9, 2008, 10:33 am