For Enock Mangezi cow dung was just another form of manure and floor polish.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/zimbabwe-cow-dung-electricity-lives-change-chiredzi-villagers
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/all-africa
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biogas
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/zimbabwe
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa