Cows graze in front of wind turbines at the Bharat Light & Power Amberi wind farms in Rewalkawadi, Maharashtra, India.

Issuance of renewable energy bonds is set to take off in Asia as new regulations push banks to step back from extending loans to projects, the Asian Development Bank (ADB) said in its June bond market report.

"Energy needs in Asia are huge," the ADB said, estimating the region's share of energy consumption globally will rise by about a half of global use by 2035, from around a third in 2010. "To ensure that the growing energy needs of Asia can be met sustainably, there will have to be increased diversification of energy sources away from fossil fuels and toward renewable energy."