6.6 TW? Dude, do you know how much you are talking about? That's more than the installation capacity of China and US put together. Why do you need so much of electricity?
I said to achieve a high standard of living with high development and use electricity for transport, industrial, residential, etc. Take a look at US and Europe and their power consumption. US is at 1.2 TW capacity and uses about 20 million barrels of oil which translates into 1.417 TW daily. That's around 2.6TW total in energy capacity. India has 4.25 times the US population so roughly India should have about 11 TW to match US levels. But I am being conservative so I reduced it about almost half so that comes around to 6.6 TW to nearly match the power consumption by US.
EU is at 11.4 million barrels of oil a day which translates into about 810 GW and has about 1.1 TW of electrical capacity for a population of 447 million people. Thats around 2 TW total in energy capacity. India's population is around 3.25 times EU's population so roughly India should have 6.5 TW in energy capacity to match EU's power consumption requirements and achieve similar standard of living.
So my figure for India is more in line with EU's consumption level and energy requirements and its high standard of living.