Not an expert, nor very even knowledgeable about the energy sector, but I do live and work in the third world, and have for most of my life. The one big factor I haven't seen mentioned nor considered on this thread about the third world using alternative fuels and energy sources is the development of transmission infrastructure for the vast populaces. Cities in the third world can probably catch or be close to most of the first world, but the drop off after that is gonna be fierce.
The US, and likely most of Western Europe, are the only countries that I am aware of where there is stout, active, and likely functional public sector guidance and involvement in transmission and distribution of things like electric lines, substations, and other infrastructure. More often than not in the third world if you really want an electric line or a pole transformer you are going to have to put it in yourself, and at great cost. Thus, most of the those coming out of abject poverty to a manageable level of poverty are not going to spend what little they have on chipping in for electric lines or other infrastructure. Much less are there going to be opportunities for things such as charging stations and other needed services. Again, this is my opinion.
Also factor in that much of the third world, at least in Latin America, is still powered by bunker fuel/Natural Gas generating plants, and they are now adding more capacity after getting real squeezed for several years. I want to say the last figures I have heard was that 75% of LatAm's electric generation was fossil fuel driven. Electrical rates in most of the developing world are sky high compared to the US and Western Europe, and fossil fuels are still the cheapest I do believe. I don't believe the economies of the third world can support the direct, or indirect, taxation to develop the alternative methods, both in generation and transmission, while also having a populace try and get out of poverty. Fossil fuels will likely remain very important to energy in the third world, again my opinion.