You mean the other power sources and energy plant not harmful to people?
Wind energy need large plato of land. Can CPI commit for that? they do not give a small portion for SEZ. Solar enenrgy needs land and place where light can fall... Doe sWB and kerala have that much free pace even between buildings? No country will provide technology that is latest to other. Learn from history with USSR.
Do you know the cost of Solar energy equipements? and any large scale plant with Solar power? How much road lights and CPi offices are using Solar power? From where Left is going to get solar panels and wind mills? Do they commit for latest technology for that? the wind mills in TN border with Kerala are outdate technolgy.