Sustainability Report 2015-16, pg 37
A table listing the specific and the total water consumption by the power stations is given. The above mentioned figure is a total of the figures given in the table.
1 cubic Megametre = 1e + 18 cubic metres.
Tata Power has not released a sustainability report for the year 2017. For more details, see the page https://www.tatapower.com/sustainability/communication.aspx