The Hornsea Two Offshore Wind Farm Order 2016

Detailed design parameters

2.—(1) No wind turbine generator forming part of Work No. 1A or 1B may—

(a) be more than 151 metres from LAT to the turbine hub;

(b) exceed a height of 276 metres from LAT to the upper tip of the vertical blade;

(c) exceed a rotor diameter of 241.03 metres;

(d) be less than 34.97 metres from LAT to the lowest point of the rotating blade;

(e) be less than 810 metres from the nearest wind turbine generator in all directions.

(2) In this Requirement, references to the location of a wind turbine generator are references to the centre point of the turbine.

(3) No offshore accommodation platform forming part of Work No. 1A or 1B may—

(a) exceed 64 metres in height above LAT;

(b) have a platform that at its greatest extent exceeds 3,600 square metres in area or 60 metres in width.

(4) No offshore HVAC collector substation forming part of Work No. 2A or 2B may—

(a) exceed 64 metres in height above LAT;

(b) have a platform that at its greatest extent exceeds 3,600 square metres in area or 60 metres in width.

(5) No offshore HVDC converter substation forming part of Work No. 2A or 2B may—

(a) exceed 110 metres in height above LAT;

(b) have a platform that at its greatest extent exceeds 16,200 square metres in area or 180 metres in width.

(6) No offshore reactive compensation substation comprised in Work No. 3A or 3B may—

(a) exceed 64 metres in height above LAT; or

(b) have a platform that at its greatest extent exceeds 3,600 square metres in area or 60 metres in width.

(7) The diameter of the electrical cables comprising the electrical circuits must not exceed—

(a) within Work Nos. 1A and 1B, 170 millimetres;

(b) within Work Nos. 2A and 2B, 300 millimetres;

(c) within Work Nos. 4A, 4B, 5A and 5B—

(i) 190 millimetres, where the mode of transmission is HVDC; and

(ii) 300 millimetres, where the mode of transmission is HVAC.

(8) The combined total length of the connections in the form of electrical circuits between the structures comprised in Work Nos. 1A and 1B must not exceed 685 kilometres.

(9) The combined total length of the connections in the form of electrical circuits between the structures comprised in Work Nos. 2A and 2B must not exceed 300 kilometres.

(10) The combined total length of the electrical circuits comprised in Work Nos. 4A, 4B, 5A and 5B seaward of MHWS must not exceed 1,200 kilometres.

(11) The combined total area of cable protection for the electrical circuits comprising Work Nos. 1A and 1B must not exceed 1,246,700 square metres.

(12) The combined total area of cable protection for the electrical circuits comprising Work Nos. 2A and 2B must not exceed 546,000 square metres.

(13) The combined total area of cable protection for the electrical circuits comprising Work Nos. 4A and 4B located outside the Humber Estuary Special Area of Conservation must not exceed 2,055,200 square metres.

(14) The combined total area of cable protection for the electrical circuits comprising Work Nos. 4A and 4B located within the Humber Estuary Special Area of Conservation must not exceed 44,800 square metres.

(15) The combined total volume of cable protection for the electrical circuits comprising Work Nos. 1A and 1B must not exceed 712,400 cubic metres.

(16) The combined total volume of cable protection for the electrical circuits comprising Work Nos. 2A and 2B must not exceed 312,000 cubic metres.

(17) The combined total volume of cable protection for the electrical circuits comprising Work Nos. 4A and 4B located outside the Humber Estuary Special Area of Conservation must not exceed 1,174,400 cubic metres.

(18) The combined total volume of cable protection for the electrical circuits comprising Work Nos. 4A and 4B located within the Humber Estuary Special Area of Conservation must not exceed 25,600 cubic metres.

(19) The electrical circuits comprised in Work Nos. 1A, 1B, 2A, 2B, 4A and 4B must be installed by use of, or a combination of, ploughing, trenching, jetting, rock-cutting, dredging, surface laying with post-lay burial and, where ground conditions make burial impracticable, by surface laying.

(20) The electrical circuits comprised in Work Nos. 5A and 5B must be installed by use of, or a combination of, a trenchless technique, ploughing, trenching and jetting, with the exception that, where the electrical circuits comprised in Work Nos. 5A and 5B cross under the existing sea wall, they must be installed using a trenchless technique.

(21) The combined total area in which the underground electrical circuit transition joint bays comprised in Work Nos. 6A and 6B may be contained must not exceed 2,000 square metres, and no underground electrical circuit transition joint bay within that area may individually exceed 25 metres in length or 10 metres in width.

(22) The diameter of the cables within Work Nos. 7A, 7B, 9A and 9B must not exceed 180 millimetres.

(23) No main building forming part of Work No. 8A or 8B may—

(a) where the mode of transmission is HVDC, exceed—

(i) 40 metres in height;

(ii) 69.5 metres in width;

(iii) 135 metres in length; or

(b) where the mode of transmission is HVAC, exceed—

(i) 15 metres in height;

(ii) 18.5 metres in width;

(iii) 82.5 metres in length.

(24) The combined total area of the site of Work Nos. 8A and 8B must not exceed 35,672 square metres, excluding any area of land required for landscaping and mitigation.

(25) The electrical circuits comprised in Work Nos. 7A and 7B must be installed by use of a trenchless technique where crossing under a main river.

(26) The width of the corridor occupied by the connection comprised in Work Nos. 7A and 7B following completion of construction of those works must not exceed 30 metres, except where those works overlap with Work No. 5A, 5B, 6A or 6B in which case the width of the corridor occupied by the connection comprising Work Nos. 7A and 7B must not exceed 150 metres.