According to an earlier Bloomberg New Energy Finance report, clean energy investment slid 22 percent worldwide in the first quarter of 2013.

Investment in renewable and energy-efficiency technologies in the US fell 54 percent to $4.5 billion, while investment in China declined 15 percent to $8.8 billion during the period.

"Each year the first quarter is generally down, although is not down this much. This was the worst first quarter since 2009. As the economy improves, I think the market is pretty resilient," added Cuttino.

Lin said: "China has little problem in keeping a 30 percent annual growth in clean energy investment, largely due to a relatively low base.

"Also, the government has taken more action to help struggling manufacturers survive."

Established in 1948, The Pew Charitable Trusts is an independent US-based non-profit non-governmental research and public policy organization.