As implausible as it sounds, cattle poop can generate the electric power to light up thousands of households in Punjab, which has a livestock population of five and a half million buffalos and 1.2 million cows.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/biogas-may-end-power-woes
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/tribune-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/livestock
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/buffalo
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dairy-development
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biogas
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/world-bank
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ludhiana-d
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rajasthan