You should be following the Tech4dev on twitter, because, if you were, you would have gotten this shocking statistic quicker:
1.6B ppl live “off the grid”; 80% of them on $1-$2/day. Yet in Kenya, these homes spend $200/yr on alt energy – fuel, etc.
That $200 a year (out of $365 for those who live on $1/day) goes toward lighting and cooking fuel, mobile phone charging, dry cell batteries, and car-battery charging.