Rampion Offshore Wind Farm - Sussex Wind Energy · Rampion Offshore Wind Farm Offshore Work...

Rampion Offshore Wind Farm Offshore Work Packages

Meet The Buyer Naren Mistry, Engineering Manager 26th Feb 2014

Rampion Offshore Project Scope

Design, manufacture, transportation and Installation: � Up to 175no. Wind turbines � Up to 177No. Foundations � Up to 230km Array cables �  4No. Export cables �  2No. Offshore Substations

Bathymetry & Geotechnical Investigation

Offshore Geotechnical contract: Aug 13 – Apr 14 •  183 Boreholes and Cone

Penetration Tests (CPT) •  Export cable route survey •  Extensive Lab testing •  Modelling site by combining

Geotechnical and Geophysical survey results

Subsea Geology

- Geologically complex site -  Variety of clays, sands, chalk, etc -  Paleochannels

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Electrical system schematic

O&M Building Quayside

Crew Vessels Jackup-Vessels

Offshore Substation

Array Cable

Foundation

Wind Turbine Generators

Export Cable Onshore Substation

Grid

Transition Piece

Breakdown of Offshore Contract Packages - 1 �  Wind Turbines 1. Design, manufacture, pre-assembly, commissioning 2. Installation: MPI Charter vessel plus installation contract

�  Monopile Foundations 1. Front end engineering design (FEED), basis of design (BOD), Detailed

Design - Consultancy Contract awarded 2. Fabrication Contract(s) – monopiles and transition pieces fabrication (inc

transportation) 3. Installation: Foundation Vessel Charter (inc installation) �  Jacket Foundations 1. Competitive FEED and Tender Proposal – Jacket fabricators 2. Detailed Design, fabrication & transportation – Jacket fabricator 3. Jacket Installation: Foundation Vessel Charter (inc installation) 4. Pin Pile installation: Possible small jack-up contract

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Breakdown of Offshore Contract Packages - 2 �  Export Cables 1. Preliminary Design/FEED: In-house 2. Design & Supply: Supply contract 3. Installation: Cable vessel charter (inc transportation & installation) �  Array Cables 1. Preliminary design/FEED: In-house 2. Design & Supply: Supply contract (inc cable protection system) 3. Transportation: Barge contracts 4. Installation: Cable vessel(s) charter (inc installation)

�  Offshore Substations Topsides (inc substation foundations) 1. FEED & BOD – Consultancy contract awarded 2. Design, fabrication, electrical installation, transport - Fabricator 3. Installation: Heavy lift crane vessel charter (inc installation services) 4. Supply of electrical equipment by the onshore substation EPC contractor

(inc installation & Commissioning)

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Foundation types

•  Variability of ground conditions & water depths

•  Monopile and jacket foundations (most commonly used to-date)

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Installation of monopile foundations

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Wind Turbine Transport & Installation MPI Discovery

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Turbine Tower Installation

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Turbine Nacelle Installation

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Turbine Blade Installation

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Offshore Substations

�  Electricity produced by the turbines is

transmitted by subsea array cables to the offshore substations

�  Substations house the high and medium

voltage electrical components for transformation of the 33kV voltages produced by the wind turbines to 150kV export voltage

�  Two export cables transmit the electricity from

the substations to the shore �  Substations also house control rooms,

emergency accommodation and workshops

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Installation of offshore substation topsides

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Marine Export Cables

Export Cables • The marine export cables will connect the offshore substations the landfall point. • Three core 150kV cables with fibre optics.

Export Cable Installation • Cables will be laid and ploughed to burial depth approx 1.5-2m below the sea bed.

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Array Cables

Array Cables • Connect the wind turbines to each other and to the offshore substations. • 150mm2 (33kV) and 500mm2 3 core submarine cable. Array Cable Installation •  Cables are loose laid on seabed and pulled into the transition piece through external j-tubes or internally thorough holes in the monopiles • The cables are buried by jetting or ploughing techniques. • All cables will be buried at a target depth of 1.5m under the sea bed.

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Installation Vessels MPI Adventure A2 Sea Seaworker

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Installation Vessels Ballast Nedam HLV Svanen

Offshore construction supply chain opportunities �  Major offshore construction activities over a two year period to install and

commission the wind turbines, foundations, subsea cables and offshore substations

�  As well as the major installation vessels, many smaller vessels will be required, e.g. guard boats, etc

�  Ancillary and support services for installation vessels. e.g bunkering, etc

�  Specialist services for offshore works, e.g. diving services, etc

�  Experience on other projects shows local suppliers will be required to support construction base activities, e.g plant hire, etc

�  Further details of the offshore contracts and potential opportunities in the afternoon ‘Offshore Balance of Plant’ focus group

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Thank You