Gas turbines are a good choice. Mentioned elsewhere in this thread are concerns about storing gas on site and tremendous cost. Gas is not stored on site, it comes from the gas line, which doesn't stop working when the power goes out. Regarding cost, McDonalds has experimented with running their own gas turbines per restaurant because it can be cheaper than paying for an electric line in some areas. Here is a 13 yr old article about their initial experiments with gas turbines:
Wow, neat concept for power-hungry businesses. I've been told that it's essentially impossible to go totally off-grid (in the US), i.e., you can do your own generation, but you'd sell it back into the grid and effectively pay net for consumption, which might turn out to be income.
That could be for dependent on zoning, though, but I've heard this from a few engineers designing solar systems for residential.
Probably good in some areas (Canada near a pipeline but with bad roads), and bad in seismic areas like California (gas is likely to get shut off) or California (pge malinvestment likely to cause all gas lines to explode independent of earthquake).
http://findarticles.com/p/articles/mi_m0FZX/is_6_65/ai_55084...