Thermal power plant comes with huge initial capital aside the environmental pollution. I made mention of roof top to clear the environmental issues you raised earlier. Elsewhere roof top is functioning well . Even individuals connect their excess power to the national grid and they earn from it . Hydro , wind , thermal , tidal , geothermal all comes with huge initial capital. I am of the view that , if different countries are able to utilise renewable energy effectively why can't we do the same?