EcoGeek has this piece about a very interesting development in refrigeration - a refrigerator that is heated on a stove or using any kind of cheap fuel and then placed inside a special thermos type container where it freezes whatever is placed inside it for 24 hours: http://www.ecogeek.org/content/view/2382/74/ The price also seems to be very reasonable. I can see a huge demand for this especially in South Asia. Every tea shop in the little bazaars, for example, would need these as would farmers who bear the worst brunt as far as getting regular supplies of electricity are concerned.
WARNING: DO NOT CLICK ON THE LINKS PROVIDED BELOW THE ECOGEEK POST. They lead to a fraud anti-virus site. Google up information about Adam Grosser instead.