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Here is how it runs. For around $80, EGG-energy results in in and wires a home for power. They put in a security light outside, and two lights inside; one marches in the common room, and the other in a bedroom. The whole process, the company states, takes about one and half hours to total. And if $80 seems high for the installation, consider that it may cost between $400 and $800 to have set up to the grid in Tanzania.

Then, once the home is actually sent, the occupants will obtain a subscription to a rechargeable battery, which is then set up to pin the home system. The battery is nothing fancy - it is an off-the-shelf closed lead-acid battery, with chemistry similar to those put into use in cars. This version, though, is actually a bit lighter and more hardy.

"It can easily always be sent over the roads here reliably," says Yang.

"And it only weighs four to five kilos," adds Solomon Faraji. "People place it on their bikes or lug it on their heads."

Typically the battery's charge lasts between three and 10 days, counting on usage. Then, the battery can easily be go back to one of EGG-energy's asking for and distribution stations, and be changed out out for a fully charged one. "The whole process may take three minutes," claims Faraji. "They come, we confirm their subscription, and then they possess a energized battery and they are generally on their way again."