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  • Hornsea Project Three Offshore Wind Farm

    Hornsea Project Three

    Offshore Wind Farm

    Environmental Statement: Chapter 3: Project Description

    PINS Document Reference: A6.1.3 APFP Regulation 5(2)(a)

    Date: May 2018

  • Chapter 3 - Project Description Environmental Statement May 2018

    i

    Environmental Impact Assessment

    Environmental Statement

    Volume 1

    Chapter 3 Project Description

    Report Number: A6.1.3

    Version: Final

    Date: May 2018

    This report is also downloadable from the Hornsea Project Three offshore wind farm website at:

    www.hornseaproject3.co.uk

    rsted

    5 Howick Place,

    London, SW1P 1WG

    Orsted Power (UK) Ltd, 2018. All rights reserved

    Front cover picture: Kite surfer near a UK offshore wind farm Orsted Hornsea Project Three (UK) Ltd., 2018.

    Prepared by: Orsted

    Checked by: Andrew Guyton and Jennifer Brack

    Accepted by: Sophie Banham

    Approved by: Stuart Livesey

    http://www.hornseaproject3.co.uk/

  • Chapter 3 - Project Description Environmental Statement May 2018

    ii

    Table of Contents

    3. Project Description ............................................................................................................................... 1

    3.1 Introduction .................................................................................................................................................. 1

    3.2 Design Envelope approach .......................................................................................................................... 1

    3.3 Hornsea Three boundary ............................................................................................................................. 2

    3.4 The Agreement for Lease (AfL) area ........................................................................................................... 2

    3.5 Project infrastructure overview..................................................................................................................... 4

    3.6 Offshore infrastructure ................................................................................................................................. 6

    3.7 Onshore infrastructure ............................................................................................................................... 47

    3.8 Construction Phasing ................................................................................................................................. 65

    3.9 Operation and maintenance ...................................................................................................................... 67

    3.10 Repowering ............................................................................................................................................... 73

    3.11 Security ...................................................................................................................................................... 73

    3.12 Health and safety ....................................................................................................................................... 74

    3.13 Waste management ................................................................................................................................... 74

    3.14 Decommissioning phase ............................................................................................................................ 74

    3.15 References ................................................................................................................................................ 75

    List of Tables

    Table 3.1: Maximum design scenario: Avoidance buffers for UXOs. ..................................................................... 7 Table 3.2: Maximum design parameters for boulder clearance in the Hornsea Three array area. ........................ 9 Table 3.3: Maximum design parameters for boulder clearance in the Hornsea Three offshore cable corridor. ... 10 Table 3.4: Maximum design parameters for sandwave clearance in the Hornsea Three offshore cable corridor.

    ........................................................................................................................................................... 11 Table 3.5: Maximum design parameters for sandwave clearance in the Hornsea Three array area. .................. 11 Table 3.6: Maximum design scenario: turbines. .................................................................................................. 12 Table 3.7: Maximum design parameters for turbine oils and fluids for a single turbine. ...................................... 13

    Table 3.8: Wind turbine installation assumptions. ............................................................................................... 14 Table 3.9: Foundation options for turbines and offshore structures. .................................................................... 17 Table 3.10: Maximum design parameters for turbine foundations. ........................................................................ 18 Table 3.11: Maximum design parameters for offshore transformer substation foundations. ................................. 18 Table 3.12: Maximum design parameters for surface offshore HVAC booster station foundations. ...................... 18 Table 3.13: Maximum design parameters for subsea offshore HVAC booster station foundations. ...................... 18 Table 3.14: Maximum design parameters for offshore HVDC collector substation foundations. ........................... 19 Table 3.15: Maximum design parameters for offshore accommodation platform foundations. .............................. 19 Table 3.16: Maximum design parameters for monopiles. ...................................................................................... 20 Table 3.17: Vessel and helicopter requirements for monopile, piled jacket, suction bucket jacket and mono

    suction bucket installation. .................................................................................................................. 21 Table 3.18: Piling scenario for monopile installation using a maximum hammer energy of 5,000 kJ. ................... 21 Table 3.19: Maximum design parameters for jacket foundations with pin piles. .................................................... 22 Table 3.20: Maximum design parameters for jacket foundations with suction buckets. ......................................... 23 Table 3.21: Maximum design parameters for mono suction bucket....................................................................... 23

    Table 3.22: Maximum design parameters for gravity base foundations. ................................................................ 24 Table 3.23: Vessel requirements for gravity base foundations for turbines if floated to site. ................................. 24 Table 3.24: Maximum design parameters for OSS piled jacket foundations. ........................................................ 25 Table 3.25: Maximum design parameters for OSS suction bucket jacket foundations. ......................................... 25 Table 3.26: Maximum design parameters for box type gravity base foundations. ................................................. 25 Table 3.27: Maximum design parameters for converter piled jacket foundations. ................................................. 26 Table 3.28: Maximum design parameters for converter suction bucket jacket foundations. .................................. 26 Table 3.29: Maximum design parameters for pontoon gravity base type 1 foundations. .................................... 26 Table 3.30: Maximum design parameters for pontoon gravity base type 2 foundations. .................................... 27 Table 3.31: Maximum design parameters for array cables. ................................................................................... 27 Table 3.32: Maximum design parameters for array cable installation. .................................................................. 29 Table 3.33: Maximum design parameters for array cable installation rock placement. ...................................... 29 Table 3.34: Maximum design parameters for array cable installation vessel and helicopter requirements. .......... 29 Table 3.35: Maximum design parameters for offshore accommodation platforms. ................................................ 30 Table 3.36: Maximum design parameters for offshore accommodation platforms chemicals. ............................ 30 Table 3.37: Infrastructure required for High Voltage Alternating Current (HVAC) and High Voltage Direct Current

    (HVDC) systems. ................................................................................................................................ 31 Table 3.38: Cables required per circuit. ................................................................................................................. 31 Table 3.39: Maximum design parameters for offshore transformer substations. ................................................... 32 Table 3.40: Maximum design parameters for offshore substation and accommodation platform installation. ....... 33 Table 3.41: Maximum design parameters for offshore HVDC converter substations. ........................................... 34 Table 3.42: Maximum design parameters for offshore surface HVAC booster station(s). ..................................... 35 Table 3.43: Maximum design parameters for offshore subsea HVAC booster station(s). ..................................... 35 Table 3.44: Maximum design parameters for offshore export cables. .........................................................