Later, William built a second windmill. This one brought water up from underground. After that William began to teach other people how to build windmills. He also continued to build more of them himself, including one at a primary school in Malaw.
Because of his success with the windmills, William was able to go back to school. He also helped with other projects, including solar power, clean water, and malarias prevention. He wrote a book about his life, The Boy Who Harnessed the Wind: Creating Currents of Electricity and Hope In addition, he uses his website, movingwindmills org, to educate and give hope to people. His main message is this: "To the Africans, and the poor who are struggling with your dreams... trust yourself and believe. Whatever happens, don't up give