The Sheringham Shoal and Dudgeon Extensions Offshore Wind Farm Order 2024

Design parameters

Offshore Substation Platform

1.—(1) The dimensions of the offshore substation platform in Work No. 3A or 3C (excluding towers, masts and cranes) must not exceed—

(a) 70 metres in length;

(b) 40 metres in width; or

(c) 50 metres in height above HAT.

(2) Offshore substation platform foundation in Work No. 3A or 3C must be of one of the following foundation options: piled jacket or suction bucket jacket.

(3) The offshore substation platform foundation in Work No. 3A or 3C must not—

(a) have more than four legs;

(b) have more than eight piles;

(c) have a pile diameter exceeding 3.5 metres;

(d) employ a hammer energy during installation exceeding 3,000 kilojoules;

(e) have a seabed footprint (excluding subsea scour protection) exceeding 452 square metres; or

(f) have a seabed footprint (including subsea scour protection) exceeding 4,761 square metres.

(4) The total amount of scour protection for the offshore substation platform in Work No. 3A or 3C must not exceed 4,054 square metres.

(5) The total volume of scour protection for the offshore substation platform in Work No. 3A or 3C must not exceed 7297 cubic metres.

Cables and cable protection

2.—(1) In the event of scenario 1, scenario 2 or scenario 3, within Work Nos. 3A to 5A, the offshore export cables must not, in total—

(a) exceed one in number;

(b) exceed 40 kilometres in length;

(c) exceed four cable crossings;

(d) have cable protection (including cable crossings) exceeding 9,504 square metres in area; or

(e) have cable protection (including cable crossings) exceeding 6,885 cubic metres in volume.

(2) In the event of scenario 4 within Work Nos. 3C to 5C, the offshore export cables must not, in total—

(a) exceed two in number;

(b) exceed 80 kilometres in length;

(c) exceed eight cable crossings;

(d) have cable protection (including cable crossings) exceeding 16,008 square metres in area; or

(e) have cable protection (including cable crossings) exceeding 12,645 cubic metres in volume.

(3) In the event of scenario 4, within Work Nos. 4C the interlink cables must not, in total—

(a) exceed seven in number;

(b) exceed 154 kilometres in length;

(c) exceed six cable crossings;

(d) have cable protection (including cable crossings) exceeding 12,708 square metres in area; or

(e) have cable protection (including cable crossings) exceeding 3,396 cubic metres in volume.