Conversion of Energy

Energy is just another form of wealth....So the per capita income is much more relevant than the population density....the most efficient energy production is from hydroelectric, followed by nuclear....next you might go with gas turbine with cogeneration of waste heat or coal fired.....

http://www.internationalrivers.org/resources/hydro-electric-projects-on-river-ganga-7575

http://en.wikipedia.org/wiki/Electricity_sector_in_India

Try an internet search for "mechanical energy harvesting" there are plenty of ideas and designs that have or are being developed and tried, even sidewalks and stairs that harvest energy from people moving across them.

You should go with cost/benefit, the one that gives you the biggest ruckus for the rupee.

Reduce spending on armed forces,space race etc and look after human needs like water,electricity,roads,toilets,housing,safety & security,human rights etc remove/ban caste system discriminating women,children,disabled,animals etc & use wind,solar,geothermal,ocean energy instead of burning oil/coal.

Try "Matrix" instead!

You should see the engine room of Holland America Cruise Line's Hamsterdam.