China's first deep-sea floating wind power platform, invested in and built by the China National Offshore Oil Corporation (CNOOC), has completed its floating body assembly, Xinhua news agency reported.

It marks an important step in the construction of the world's first offshore wind power project with a water depth of over 100 metres and an offshore distance of over 100 kilometres, said Tuesday's edition of Science and Technology Daily.

The platform will be installed in an offshore oil field 136 kilometres from Wenchang, in China's southern island province of Hainan -- where strong winds and big ocean waves posed a huge challenge to the design of the wind power platform.

According to the newspaper, after the project is put into operation, the electricity generated by the turbine will be connected to the power grid of the offshore oilfield group for oil and gas production, with an annual power generation capacity of 22 million kilowatt-hours -- saving 7.73 million cubic metres of fuel gas and reducing carbon dioxide emissions by 22,000 tonnes.