The Ministry of New and Renewable Energy (MNRE) recently unveiled a clean energy rollout trajectory that will require setting up solar power projects of 77 GW capacity by 2020 with an approximate investment of ₹3,500 billion (~$54.56 billion).
https://mercomindia.com/seci-expression-inter...facturing/
$54.56B/77Gw = $708M/Gw