Once flying from the US to Delhi, a flight attendant came to get me in the middle of the night, and waved me over to an open window row to show me the border. It's quite pretty, but it is striking how few lights are on other than the border itself.
A few reasons for that:
1) The border between India and Pakistan is one of the less populated regions of both countries, for a variety of reasons.
2) Many cities in India have a variety of load-mitigation ordinances in effect to reduce power and water consumption. I'm not sure what the state is these days in Delhi and nearby areas, but it's similar to what's done in parts of the US, just on a larger scale.
3) Power is expensive! In the US, it's astonishing how much electricity we waste, even (or especially) at night. India is overall a less wealthy country, so people naturally conserve electricity much more than we're used to over here.