Sub-Saharan Africa is the poorest part of the world. The World Bank reports that per capita income there has increased from $899 in 2006, to $1638 in 2014. I believe that per capita means everyone, including children. This is $136 a month.
http://data.worldbank.org/indicator/NY.GNP.PCAP.CD/countries/ZF?display=graph I believe this means cold fusion devices will be well within reach of most families by the time they are developed. A 3.5 kW standby generator today cost $353. If these generators were mass-produced in large numbers, I believe the cost would fall to about $170. A bicycle in the Third World cost about $100. Most families can afford bicycles, so I expect they will be able to afford 3.5 kW generators. This is enough for cooking, heating, illumination, pumping water, or running power tools (albeit not all at the same time). Today's standby generator would not be suitable for constant use 365 days a year. However I do not think it would be difficult to engineer a constant duty machine, perhaps with a battery, a super capacitor, and/or forced air bearings. Regarding air bearings see: http://www.capstoneturbine.com/technology http://www.newwayairbearings.com/sites/default/files/new_way_application_and_design_guide_%20Rev_E_2006-01-18.pdf - Jed
