Recently, the nonprofit organization Green Wi-Fi introduced its solar-powered Wi-Fi router. Their objective : to bring the Internet to schools in developing countries via cheap Wi-Fi networks. Of course, that is a excellente idea, which is explained in details in the article here on CNET.
There is another solution that I suggested a year ago to the PLC Powerline Communications vendor LEA : a PLC router powered by a wind generator coupled to a WiMax antenna. Imagine you live in the country side : no way to get a FTTH connection someday; enters WiMax, which is, among other things, aimed at bringing high-speed internet access to rural areas. Then, imagine you generate your own power for your domestic apps such as computers with a wind-generator. It's easy to combine the WiMax antenna with that wind generator and to a powerline router, which will broadcast all the Triple or QuadPlay services into your home...