Malawi: Upgrading the windmill made from local materials

William Kamkwamba, who built a windmill from local materials, writes about the work of upgrading the windmill and home power system ^[1]:
“1. First we planned the locations of all the new lights, switches and power outlets.
2. Then, we installed conduit and lighting, switch and outlet boxes throughout the house. Where the wall was hard enough, we dug trenches in the walls to bury the conduit using a hammer and chisel.”