"...A clean energy group in the US has estimated investment in energy infrastructure over the next four decades globally to reach USD 36 trillion. That is a very large number and it should be very attractive for the private sector," he said at a CII conference on financing clean energy.
According to Moniz, the investment would be about 0.6 per cent of the cumulative world GDP over this time (by 2050).
"The scale (of investment in clean energy) indicates the opportunity that we (India and US) will have in this clean energy transformation," Moniz said.
The US Energy Secretary said much of the recent weather changes around the world was due to global warming.
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The World Meteorological Organization said last month that parts of the world witnessed a series of extreme weather conditions in the first six weeks of 2014, continuing a pattern set in December 2013.
On the need to reduce the cost of clean energy, he said, "Cost reductions in clean technologies continue to advance in dramatic fashion and (yet) we still need reduction in cost."
Moniz is in India for the US-India Energy Dialogue, which was previously postponed due to a row over the treatment of an Indian diplomat in the US.
"Our dialogue has been very successful," he said, adding that in today's report, they would hear about progress in the solar and energy efficiency space.
The dialogue is co-chaired by Planning Commission Deputy Chairman Montek Singh Ahluwalia and Moniz.
"I completely agree that we need to little bit bend backward to make sure that regulatory restrictions and other restrictions that affect financing are little more favourable (to clean energy projects)," Ahluwalia said while addressing the conference.