while under certain circumstances projects utilizing diesel generators or dieselret hybrids may be more appropriate the choice of renewables has the advantage of limiting an increase in fossil fuel imports this is an important consideration in times of economic crisis tighter national budgets and volatile oil prices finally at the household level access to electricity particularly if based on rets can also improve the energy security of families as they are no longer subject to oil price fluctuations and to what can be high costs of transportation and delivery of fuel this of course is only valid where rets have a comparative advantage over fossil fuels in terms of resources and costs