# The Hornsea One Offshore Wind Farm Order 2014, Paragraph 2: Detailed design parameters

Extent: E+W+S

(1) All wind turbine generators forming part of Works Nos. 1, 2 and 3 must not—
(a) be less than 82 metres to the turbine hub when measured from MHWS;
(b) exceed a height of 200 metres from MHWS to the upper tip of the vertical blade;
(c) exceed a rotor diameter of 178 metres;
(d) be less than 22 metres from MHWS to the lowest point of the rotating blade;
(e) be less than 924 metres from the nearest wind turbine generator in all directions.
(2) Each offshore HVAC collector substation forming part of Work No. 4 must not—
(a) exceed 60 metres in height above MHWS;
(b) have a platform which at its greatest extent exceeds 2,400 m2 or 40 metres in width.
(3) Each offshore HVDC converter station forming part of Work No. 4 must not—
(a) exceed 63 metres in height above MHWS;
(b) have a platform which at its greatest extent exceeds 7,200 m2 or 120 metres in width.
(4) Each offshore accommodation platform forming part of Works Nos. 1, 2, and 3 must not—
(a) exceed 60 metres in height above MHWS;
(b) have a platform which at its greatest extent exceeds, 3,600 m2 or 60 metres in width.
(5) The offshore reactive compensation substation comprised in Work No. 5 must not—
(a) exceed 63 metres in height above MHWS; or
(b) have a platform which at its greatest extent exceeds 2,500 m2 or 50 metres in width.
(6) The diameter of the electrical cables comprising the electrical circuits must not exceed the following limitations—
(a) within Works Nos. 1, 2 and 3, 170 mm;
(b) within Work No. 4, 300 mm;
(c) within Work Nos. 6 and 7, 200 mm where the mode of transmission is HVDC and 300 mm where the mode of transmission is HVAC.
(7) The combined length of the inter-array electrical circuits comprised in Works Nos. 1, 2 and 3 must not exceed 450 km.
(8) The total length of the electrical circuits comprised in Work No. 4 must not exceed 80 km.
(9) The combined total area of cable protection for the electrical circuits comprising Works Nos. 1, 2 and 3 must not exceed 450,000 m2.
(10) The total area of cable protection for the electrical circuits comprising Work No. 4 must not exceed 80,000 m2.
(11) The total area of cable protection for the electrical circuits comprising Work No. 6 located outwith the Humber Estuary Special Area of Conservation must not exceed 1,468,000 m2.
(12) The total area of cable protection for the electrical circuits comprising Work No. 6 located within the Humber Estuary Special Area of Conservation must not exceed 12,800 m2.
(13) The combined total length of the electrical circuits comprised in Works Nos. 6 and 7 seaward of MHWS must not exceed 600 km.
(14) The combined total volume of cable protection for the electrical circuits comprising Works Nos. 1, 2 and 3 must not exceed 562,500 m3.
(15) The total volume of cable protection for the electrical circuits comprising Work No. 4 must not exceed 100,000 m3.
(16) The total volume of cable protection for the electrical circuits comprising Work No. 6 located outwith the Humber Estuary Special Area of Conservation must not exceed 1,835,000 m3.
(17) The total volume of cable protection for the electrical circuits comprising Work No. 6 located within the Humber Estuary Special Area of Conservation must not exceed 16,000 m3.
(18) The electrical circuits comprised in Works Nos. 1, 2, 3, 4 and 6 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.
(19) The electrical circuits comprised in Work No. 7 must be installed by use of, or a combination of, ploughing, trenching and jetting.
(20) The total area in which the four underground transition pits comprised in Work No. 8 may be contained must not exceed 1,000 m2 and none of the four transition pits within that area must individually exceed 25 m by 10 m.
(21) The diameter of the cables within Works Nos. 9 and 11 must not exceed 300 mm in diameter.
(22) The main building comprised in Work No. 10 (the electrical transmission station) must not—
(a) exceed 24 metres in height;
(b) exceed 80 metres in width;
(c) exceed 120 metres in length.
(23) The site of Work No. 10 must not cover more than 32,200 m2 in area, excluding any area of land required for landscaping and mitigation.
(24) References to the location of a wind turbine generator are references to the centre point of the turbine.

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Source: https://www.legislation.gov.uk/uksi/2014/3331/schedule/1/part/3/paragraph/2 (the official version)
Page: https://openlegislation.uk/hornsea-one-offshore-wind-farm-order-2014/schedule-1/part-3/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.