"It (China) has enormous wind resources ... The Chinese government is recognising that," Oakley said, while announcing a study on wind potential in the southern Chinese province of Guangdong, known as the world's manufacturing centre.

In February, China's parliament passed a renewable energy law, which will take effect next January, which sets tariffs in favour of non-fossil energy such as water, wind and solar power.

With Beijing aiming to build 20 gigawatts of wind power by the year 2020, Graham White, managing director of Garrad Hassan Pacific Pty Ltd. from Australia said China was likely to overtake Germany, Spain, the United States and India as the top wind user.

The official from Garrad Hassan, which conducted the study on behalf of Greenpeace, said the target compared with the world's total installed wind capacity of 55 gigawatts presently.

"Onshore wind will be the cheapest energy source of all the options for Europe in the year 2020 ... Same economics are going to be true for China," White added, referring to a 2003 study, commissioned by the U.K. government.

In Guangdong, the local government has set its own target to raise wind power to 3,000 megawatts by 2020 from 86 megawatts, he said, while its potential was estimated at 20,000 megawatts.

Wim Lansink, general manager of Shantou Dan Nan Wind Power Co. Ltd in Guangdong, calculated this would require investment of $15-$20 billion. Shantou Dan Nan is a joint venture between Dutch utility Nuon and the power authorities of Shantou city.