O P Bhatt = 3.30 Mega Watts per day

Last week the world observed Earth Day by switching off lights for one hour.

State Bank of India is having more than 10,000 branches spread all over India and some abroad. If the Bank decides to switch off one 25 watt bulb per branch, imagine how much power it can save.

Assuming the Bank works for 9 hours per day the savings comes to:


25 watts * 9 hours *10000 branches = 22,50,000 watts per day or 2.25 MW per day.

Suppose instead of switching off the lights, SBI donates those 10,000 CFLs with the help of some NGO and these are used instaed of one 60 watt incandescent bulb.

Then the power savings assuming 3 hours of usage from 7 pm to 10 pm works out to:


35 watts (60 W - 25 W) * 3 hours *10000 bulbs = 10,50,000 watts per day or 1.05 MW per day.

So total savings comes to 3.30 MW per day.

Assuming 300 days net of holidays for the bank and house holds total power saved for a year comes to 3.35 MW * 300 = 1005 MW per year.

Contrast this with the total owned installed capacity of India's largest power producer, NTPC Ltd which is 27850 MW per day. So the savings per year is approximately 3.61% of the power generated by NTPC per day.

The reason I have chosen SBI is that with a single circular issued by O P Bhatt, this much power can be saved.

What is more, SBI being a public institution such an initiative will get lots of attention not only in India but all over the world and there will be many to emulate the same.

Thus O P Bhatt = 3.30 Mega Watt per day.