On a mass scale, solar energy would be economical to coal-fired thermal energy, he added.

"India has already reached a point where installation of large scale photovoltaic (PV) energy sources is on priority with coal, if you look at imported coal and as India develops its energy demands, you will either go for more import of coal or you can install PV. I am going to argue that it is in India's economic benefit to go down this route," King said.

A recent report prepared by Bridge to India and Tata Power Solar says that India has the potential to create 1,45,000 MW of capacity and 6.7 lakh jobs in solar power sector over the next 10 years.

The British representative Sir David King was in New Delhi to meet Indian officials, ahead of the Climate Summit convened by UN Secretary General Ban Ki-moon in New York on September 23.

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