India is all set to emerge among the top five nations in G-20 group in terms of clean energy investments. In a report brought out by the US based Pew Charitable Trust, the annual clean energy investment in India is expected to grow phenomenally over the next 10 years. AIR correspondent reports, the sector is a 2.3 trillion dollar opportunity.Within the G-20, India is on tract to climb from the tenth to the third place in terms of clean power project investments worldwide. It is likely to attract 169 billion dollar in wind, solar, small hydro, geothermal and marine energy projects in the next decade. Enhanced clean energy policies would increase private investments in India by 48 per cent, tied with the U.K. The report says, under all policy scenarios, India, China, Japan and South Korea will account for 40 per cent of clean power project investment over the next 10 years. India is projected to increase its renewable energy generating capacity to 91GW during the same period which will be five times than what is currently installed.