Green wifi
(taken from webpage) Green wifi is committed to providing solar powered access to global information and educational resources for developing regions and K-12 school children striving for knowledge in a digitally divided world.
Green WiFi addresses one of the biggest barriers to success: the lack of reliable electricity in developing areas required to power the network. Green WiFi has developed a low cost, solar-powered, standardized WiFi access solution that runs out-of-the-box with no systems integration or power requirements. All that is required is a single source of broadband access. Green WiFi nodes can then be deployed on rooftops to form a self-healing network that hops the source signal over a virtual 802.11b/g grid. Because these nodes require no fixed installation or power tie-ins, these nodes can form an unplanned, mobile grid that can grow or be relocated as needed.