The Bhandup plant treats 2,300 MLD (million litres daily) of water. It requires 45 lakh units of power on a monthly basis, which comes to 5.40 crore units every year.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-treatment-plant-bhandup-gets-solar-power-unit-2-years
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solar-energy
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/municipal-corporation
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electricity
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy