The Hornsea Two Offshore Wind Farm Order 2016

Design parameters

2.—(1) The undertaker must in fixing to the seabed any structures comprised in Work No. 1B use one of the following methods—

(a) monopile foundations;

(b) jacket foundations supported by piles; or

(c) gravity base foundations.

(2) The following parameters apply in respect of the foundation methods used to fix wind turbine generators comprised in Work No. 1B to the seabed—

(a) where monopile foundations are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 1,963 square metres;

(ii) the diameter of each foundation must not exceed 10 metres;

(b) where jacket foundations (driven/drilled piles) are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 2,827 square metres;

(ii) the number of piles per jacket must not exceed 12;

(iii) the diameter of each pile must not exceed 6 metres;

(c) where jacket foundations (suction piles) are used—

(i) the area occupied by the foundations and scour protection for each individual structure must not exceed 12,596 square metres;

(ii) the number of piles per jacket must not exceed 4;

(iii) the diameter of each pile must not exceed 21.1 metres;

(d) where gravity base foundations are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 7,543 square metres;

(ii) the seabed levelling diameter must not exceed 78 metres;

(iii) the cone diameter must not exceed 58 metres at its base.

(3) The following parameters apply in respect of the foundation methods used to fix offshore accommodation platforms to the seabed—

(a) where monopile foundations are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 1,963 square metres;

(ii) the diameter of each foundation must not exceed 10 metres;

(b) where jacket foundations (driven/drilled piles) are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 1,414 square metres;

(ii) the number of piles must not exceed 8;

(iii) the diameter of each pile must not exceed 3 metres;

(c) where jacket foundations (suction piles) are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 6,362 square metres;

(ii) the number of piles per jacket must not exceed 4;

(iii) the diameter of each pile must not exceed 15 metres;

(d) where gravity base foundations are used—

(i) the area occupied by the foundations and the scour protection for each individual structure must not exceed 6,362 square metres;

(ii) the seabed levelling diameter must not exceed 70 metres;

(iii) the cone diameter must not exceed 50 metres at its base.

(4) The total volume of scour protection for the wind turbine generators and the offshore accommodation platforms forming part of Work No. 1B must not exceed 4,761,555 cubic metres, provided that the combined total volume of scour protection for the wind turbine generators and the offshore accommodation platforms forming part of Work Nos. 1A and 1B must not exceed 4,761,555 cubic metres.