 Spending began in earnest in 2004, and by 2018 INR 250 crore has been spent on various feasibility studies and surveys.By July 2019, 25 of the 43 feasibility studies for the ecological, environmental, social and financial impact, etc were complete; 8 more were underway; remaining 10 surveys will take 3 to 5 years to complete i.e.by 2021-23.