# The Hornsea Four Offshore Wind Farm Order 2023, Paragraph 3: Details of licensed marine activities

Extent: E+W+S

Such activities are authorised in relation to the construction, maintenance and operation of—
Work No. 2—
(a) up to six small offshore transformer substations each fixed to the seabed by one of monopile foundations, mono suction bucket foundations, gravity base structures or jacket foundations, and which may be connected to each other or one of the offshore accommodation platforms within Work No. 1(b) by a bridge link;
(b) up to three large offshore transformer substations each fixed to the seabed by one of monopile foundations, mono suction bucket foundations, box–type gravity base structures, or jacket foundations, pontoon gravity base type 1 structures, or pontoon gravity base type 2 structures, and which may be connected to each other or one of the offshore accommodation platforms within Work No. 1(b) by a bridge link;
(c) in the event that the mode of transmission is HVDC, either up to three either large HVDC converter substations or up to six small HVDC converter substations fixed to the seabed within the area shown on the offshore works plan by one of monopile foundations, mono suction bucket foundations, jacket foundations, box–type gravity base structures, gravity base structures, pontoon gravity base type 1 structures, or pontoon gravity base type 2 structures;
(d) a network of interconnector cables;
(e) up to six cable circuits between Work No. 2 and Work No. 3, and between Work No. 3 and Work No. 5 consisting of offshore export cables along routes within the Order limits seaward of MLWS including one or more cable crossings; and
(f) up to eight temporary horizontal directional drilling exit pits and associated cofferdams.
Work No. 3—
(a) in the event that the mode of transmission is HVAC, up to three offshore HVAC booster stations fixed to the seabed within the area shown on the offshore works plan by one of monopile foundations, mono suction bucket foundations, jacket foundations, gravity base structures, pontoon gravity base type 1 structures or pontoon gravity base type 2 structures; and
(b) in the event that the mode of transmission is HVAC, up to six cable circuits between Work No. 2 and Work No. 3, and between Work No. 3 and Work No. 5 consisting of offshore export cables along routes within the Order limits seaward of MHWS including one or more cable crossings.
Work No. 4— a temporary work area associated with Work No. 2 and Work No. 3 for vessels to carry out anchoring and positioning alongside Work No. 2 or Work No. 3.
Work No. 5— works consisting of—
(a) up to six cable circuits and associated electrical circuit ducts between Work No. 3 to Work No. 6; and
(b) up to eight horizontal directional drilling exit pits, unless Work No. 2(f) is constructed.
Work No. 9— temporary works as follows—
(a) temporary vehicular access tracks as shown on the offshore works plans;
(b) temporary construction ramp as shown on the offshore works plans.
In connection with such Works Nos. 2, 3, 4 and 5 and to the extent that they do not otherwise form part of any such work, further associated development within the meaning of section 115(2) (development for which consent may be granted) of the 2008 Act comprising such other works as may be necessary or expedient for the purposes of or in connection with the relevant part of the authorised scheme and which fall within the scope of the work assessed by the environmental statement and the provisions of this license, including—
(a) scour protection around the foundations of the offshore electrical installations;
(b) cable protection measures such as the placement of rock and/or concrete mattresses;
(c) the removal of material from the seabed within the Order limits the disposal within—
(i) the array area disposal site, in combination with the disposal authorised by the deemed marine licence granted under Schedule 11 of the Order, of up to 7,211,601 cubic metres of inert material of natural origin produced during construction drilling or seabed preparation for foundation works and cable installation preparation works (such as sandwave clearance and boulder clearance) and excavation of horizontal directional drilling pits works within the parts of Work No. 2 that lie within the array area; and
(ii) the cable corridor disposal site up to 4,105,735 cubic metres of inert material of natural origin within Order limits produced during construction drilling and seabed preparation for foundation works and cable sandwave clearance works required or the construction of Work Nos. 2 (which lie within the cable corridor), 3, 4 and 5; and
(d) temporary landing places, moorings or other means of accommodating vessels in the construction and/or maintenance of the authorised development.

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Source: https://www.legislation.gov.uk/uksi/2023/800/schedule/12/part/1/paragraph/3 (the official version)
Page: https://openlegislation.uk/hornsea-four-offshore-wind-farm-order-2023/schedule-12/part-1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.