SharedSolar is an incredibly interesting project in this regard, as Millenium Villages reports. Check it out.
"As part of the Millennium Villages project, in 2009 the Earth Institute’s Modi Research Group took up the challenge of how to bring electricity to rural villages in Africa. After analyzing the data and sociological constraints, the team arrived at an innovative solution to the problem: solar-powered micro-grids with prepaid metering and semi-automated, remote management. They called it SharedSolar: pay-as-you-go electricity via mobile telephony."
You might find this version of pay as you go solar power interesting too http://newswatch.nationalgeographic.com/2012/04/17/pay-as-you-go-sunshine-how-solar-energy-and-mobile-phones-are-powering-the-developing-world/
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