The Sheringham Shoal and Dudgeon Extensions Offshore Wind Farm Order 2024

Detailed offshore design parameters

Wind turbine generator dimensions

2.—(1) Subject to sub-paragraph ‎(4), wind turbine generators forming part of the authorised project must not—

(a) exceed a height of 330 metres when measured from HAT to the tip of the vertical blade;

(b) exceed a rotor diameter of 300 metres;

(c) be less than 1.05 kilometres from the nearest wind turbine generator in any direction;

(d) have a distance of less than 30 metres between the lowest point of the rotating blade of the wind turbine generator and HAT;

(e) exceed 23 wind turbine generators in respect of the Sheringham Shoal Extension Project offshore works; or

(f) exceed 30 wind turbine generators in respect of the Dudgeon Extension Project offshore works.

(2) The total rotor-swept area within Work No. 1A must not exceed 1.00 square kilometres.

(3) The total rotor-swept area within Work No. 1B must not exceed 1.30 square kilometres.

(4) References to the location of a wind turbine generator are references to the centre point at the base of the wind turbine generator.

Wind turbine generator foundations

3.—(1) Wind turbine generator foundations must be of one or more of the following foundation options: piled monopile, suction bucket monopile, piled jacket, suction bucket jacket or gravity base structure foundation.

(2) No wind turbine generator piled monopile or suction bucket monopile foundation may have a pile diameter exceeding 16 metres.

(3) No wind turbine generator gravity base structure foundation may—

(a) have a seabed base plate exceeding 60 metres in diameter; or

(b) have a gravel footing exceeding 62 metres in diameter.

(4) No wind turbine generator piled jacket or suction bucket jacket foundation may—

(a) have more than four legs;

(b) have more than four piles; or

(c) have a pile diameter exceeding four metres.

4.—(1) Within Work No. 1A, the wind turbine generator foundations must not have—

(a) a total combined seabed footprint (including scour protection) exceeding 483,491 square metres;

(b) a total combined amount of scour protection exceeding 429,770 square metres; or

(c) a total combined volume of scour protection exceeding 1,074,770 cubic metres.

(2) Within Work No. 1B, the wind turbine generator foundations must not have—

(a) a total combined seabed footprint (including scour protection) exceeding 610,726 square metres;

(b) a total combined amount of scour protection exceeding 542,867 square metres; or

(c) a total combined volume of scour protection exceeding 1,357,168 cubic metres.

Offshore Platform dimensions

5.  The dimensions of any offshore substation platform (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.

Offshore Platform foundations

6.—(1) Offshore substation platform foundations must be of one or more of the following foundation options: piled jacket or suction bucket jacket.

(2) No offshore substation platform foundation may—

(a) have more than four legs;

(b) have more than eight piles;

(c) have a pile diameter exceeding 3.5 metres;

(d) have a seabed footprint (excluding subsea scour protection) exceeding 707 square metres; or

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

(3) The total amount of scour protection for the offshore substation platform in Work No. 3A or 3C must not exceed 4054 square metres.

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

(5) The total amount of scour protection for the offshore substation platform in Work No. 3B or 3C must not exceed 4054 square metres.

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

Cables and cable protection

7.—(1) In the event of scenario 1, scenario 2, scenario 3 or scenario 4, within Work No. 2A the in-field cables must not, in total—

(a) exceed 36 in number;

(b) exceed 90 kilometres in length;

(c) exceed 0 cable crossings;

(d) have cable protection (including cable crossings) exceeding 4,000 square metres in area; or

(e) have cable protection (including cable crossings) exceeding 1,000 cubic metres in volume.

(2) In the event of scenario 1, scenario 2, scenario 3 or scenario 4, within Work No. 2B the in- field cables must not, in total—

(a) exceed 54 in number;

(b) exceed 135 kilometres in length;

(c) exceed seven cable crossings;

(d) have cable protection (including cable crossings) exceeding 4,000 square metres in area; or

(e) have cable protection (including cable crossings) exceeding 1,000 cubic metres in volume.

(3) 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 6885 cubic metres in volume.

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

(a) exceed one in number;

(b) exceed 62 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 6885 cubic metres in volume.

(5) In the event of scenario 1, scenario 2 or scenario 3, within Work No. 4B the interlink cables must not, in total—

(a) exceed three in number;

(b) exceed 66 kilometres in length;

(c) exceed six cable crossings;

(d) have cable protection (including cable crossings) exceeding 6708 square metres in area; or

(e) have cable protection (including cable crossings) exceeding 1896 cubic metres in volume.

(6) 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.

(7) In the event of scenario 4, within Work No. 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 3396 cubic metres in volume.