The Jiangsu Rudong (H6, H10) wind power project involves the construction of two offshore wind farms, namely H6 and H10, in the Huangshayang sea of China.

The £1.62bn ($2.10bn) project is being developed by state-owned China Three Gorges (CTG) Corporation. The H6 wind farm is being constructed by Three Gorges New Energy Nantong Company with the construction of the H10 wind farm managed by Three Gorges New Energy Rudong Company.

The construction works on the project were started in February 2020, while both the wind farms are expected to be operational by 2021.

The Jiangsu Rudong (H6, H10) offshore wind farms are expected to generate up to 2.4 billion kWh of electricity annually, powering approximately 990,000 households.

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The project will also offset up to 1.83 million tonnes (Mt) of CO2 emissions by avoiding approximately 740,000t of coal consumption a year.

Location and site details

The Jiangsu Rudong (H6, H10) offshore wind power project is being developed on a trapezoidal-shaped field located in the Huangshayang sea area to the east of Rudong County, near Nantong city, in the Jiangsu province of China.

The H6 offshore wind farm site has a length of 13.6km in the east-west direction and a width of 8.2km in the north-south direction. It is located at a distance of 50km from the shore.

The H10 offshore wind farm site is located approximately 63km away from the shore and measures approximately 8km in the east-west direction and 8.8km in the north-south direction. The planned sea area for each wind farm is approximately 66km2.

Rudong (H6, H10) offshore wind farm make-up

The Jiangsu Rudong H6 and the H10 offshore wind farms will comprise 100 4MW wind turbine units from Shanghai Electric. The rotor diameter of the wind turbines will be 146m.

The wind turbines will be installed on monopile foundations at water depths from 9m to 20m using a 600t jack-up wind power installation platform along with 1,600t floating specialised marine equipment.

The project also involves the construction of a 220kV sea booster station in each wind farm,  offshore and onshore converter stations, and an offshore auxiliary platform.

 Power evacuation

The electricity generated by the Rudong (H6, H10) offshore wind farms will be evacuated to the power grid through a 35kV submarine cable, a 400kV flexible DC transmission submarine cable, and two 220kV AC submarine cables.

Contractors engaged

Shanghai Electric was contracted for the supply of wind turbines for the Rudong (H6, H10) offshore wind power project.

Zhongtian Technology Group Offshore Engineering Company was awarded a contract worth £193.05m ($257.84m) by Three Gorges New Energy for the foundation and installation of wind turbines in December 2019.

East China Survey and Design Institute was engaged in the design and engineering works of the H6 and H10 offshore wind farms in 2019.

Chongqing Waterway Engineering Bureau was engaged by CTG for the construction of the H10 offshore wind farm.

Jiangsu Power Construction No 3 Company was contracted for the construction of an onshore converter station and the supply of auxiliary equipment for sea-land converter stations in October 2019.

Nantong Ocean Water Conservancy Engineering Company was awarded a contract for the construction of 75 sets of wind turbine foundations for the H10 offshore wind project in October 2019. The scope also includes the construction of booster stations and submarine cable laying.

Zhenhua Heavy Industry was contracted by Three Gorges Group for the construction of a 220kV sea booster station, while Haili Wind Power Company was selected for the supply of steel pipes and tower tubes.