Question: How much rainwater did the company collect and store (in cubic metres)? 
Answer:
Unknown
m3
4703209
Global Reporting Initiative
2017
Unverified - Added by Steward

Sustainability Report 2015-16, pg 37 & 62

No mention is found of the metric in the report in quantifiable terms.

Nitish Kumar Parihar.....2019-01-03 09:16:31 UTC

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

Aileen Robinson.....2019-01-21 14:27:48 UTC