THE light comes from the Gumelem River. The waterwheel placed on the river bank is moved by the water current, generating electricity to power homes in Gumelem Kulon village, Banjarnegara Regency. The power comes free of charge.

This village has been enjoying the benefits of electricity since 1991, much earlier than its neighbors in Serayu Mountains, Central Java. By imitating the working mechanism of a diesel generator, Wirya Sukadi, constructed