As to the costs, after elementary amortization (over 10 years?) of the minimal capital outlay, plus negligible cost of fuel, and you’re pretty much left with staffing. Allocate a hundred thou per year for the part-time services of a supervising/maintaining engineer and techs, and divide by 5 megawatt-years, or about 40,000MWh, or 40,000,000 kwh, and you come up with 100,000/40,000,000 = $0.0025, = 0.25¢/kwh.

Once people have the option of setting up local power sources pretty much anywhere, lots of things are possible.  Existing remote communities would likely be among first adopters, btw. 

For a sci-fi book, how about stateless floating ocean communities? Also, check out “vertical farming”; it would integrate well into isolated urban clusters with independent power.