From The Daily Times:
William says after dropping out of school in 2002, because he could not raise schools fees, he had nothing to do and grew an interest in reading science books...
He says one day while reading he came across two books, Using Energy and How it Works, which are about generation of electricity using a windmill.
On a trial and error basis, he managed to make a small windmill which generated electricity enough to light his dorm. Seeing its success he planned for a bigger one so that his parents could benefit and some well-wishers gave him money to get some of the materials he needed.
"When I was making all these, some people were mocking me that I was going mad but I had confidence in what I was doing because I knew if it was written in the books then it was true and possible. When I succeeded they were impressed," explains William.
The windmill stands on a tripod of wooden polls about five metres above the ground. It consists of locally-available materials and as far as he can remember his investments were K500 for two bearings, K500 for a bicycle dynamo, K400 for a fun belt and K800 for a bicycle frame. [about $15 USD total]