Home electric power generation is one area where Stirling type engines could be much better than internal combustion types. Since power density (the size and weight per watt output) is much less an issue with stationary engines a Sirling could be more efficient than other heat engines. The bonus is that they are quiet, clean running and low maintainence. They can use a variety of fuels and even solar.
Unforntuetly, no one in USA is offering a engine sized for single family homes. Wispergen of NZ is selling a combined heat and power unit in other countries but they are still fairly expensive.
Right now you would be advized to take some equity out of your home and buy a photovotalic system. With rising gas prices, they will be a good hedge until our economy wakes up to more efficient and clean power generation.