Offshore substations

As the size of offshore wind farms increases with sites located in deeper and remoter waters, developers and owners experience additional challenges in planning the design, layout, maintenance and operation philosophies for the wind farm itself as well as for its offshore substation.

Offshore substation design


Peter Busch Nielsen, Ramboll Oil & Gas

Peter Busch Nielsen

M.Sc., civil and structural eng., Head of Department, Structures, Denmark
T: +45 5161 7238
Dag A. Nilsen, Ramboll Oil & Gas

Dag A. Nilsen

Business Development Manager, Norway
T: +47 488 93 227
Balaji Swaminathan

Balaji Swaminathan

Director - Oil & Gas India
T: +91 44 4386 7000
Jesper Thomsen

Jesper W. Thomsen

Business Development Director, North Sea
T: +45 5161 2375

Specialists in offshore substation design

Ramboll has specialised in the design of offshore substations for offshore wind farms. As a leading offshore engineering consultant, we have intimate knowledge of the challenges associated with the design, construction, maintenance and operation of offshore substations and wind farms.

Our services for offshore substation design cover:

  • Definition of design standards/codes and development of safety philosophies 
  • General topsides layout 
  • Implementation of electrical equipment and control systems 
  • Specification of all auxiliary equipment
  • Accommodation facilities and heli-decks 
  • Jacket/substructure design incl. j-tubes for cables, boat landings and foundation/piles, scour protection 
  • Installation engineering

Broad and comprehensive offshore design experience

Ramboll’s vast track record within offshore platform design is founded on four decades of offshore oil and gas experience and more than a decade designing offshore wind turbine foundations. Based on this solid background, our specialised engineers work internationally with the development and complete design of offshore substations.

Over recent years, we have carried out the detailed design of the offshore substation topsides and substructure for several of Northern Europe's largest offshore wind farms. 

Multidisciplinary design team

Ramboll’s multidisciplinary engineering team handles the entire design process from conceptualisation to detailed design – installation and commissioning.

We design substructures/jackets and develop topsides layouts with consideration to safety, mechanical handling, commissioning, operation and maintenance. The design includes implementation of electrical equipment such as transformers, reactors, GIS switchgear, MV/LV-switchgear, UPS system and SCADA/control systems and specification of all auxiliary equipment such as cranes, emergency diesel systems, workshops, fire-fighting systems and drain systems. 

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Offshore substation design

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Visualisation of Substation for Westermost Rough Offshore Wind Farm

Substation design for Westermost Rough Offshore Wind Farm

In the summer of 2011 Ramboll won the detailed design of the offshore substation for DONG Energy's Westermost Rough Offshore Wind Farm in the UK. The wind farm is estimated to make a significant contribution to the UK government goal of installing 33GW of wind production by 2020. The contract with DONG Energy included the conceptual and detailed design of the entire substation, covering both jacket and complete topside design.

Anholt Windmills

Anholt Offshore Wind Farm - Denmark's largest offshore wind farm

The Anholt Offshore Wind Farm, which was completed in 2013, is the world's third largest offshore wind farm. The 400 MW wind farm, placed in the Kattegat strait between Jutland and the island of Anholt, produces energy equivalent to the annual energy consumption of 400,000 households, or 4% of Denmark's total power consumption.

Horns Rev 2

Substation for Horns Rev 2 – offshore wind farm

Horns Rev 2 is an offshore wind farm located on Horns Rev (Horns Reef) in the eastern North Sea, about 30 km off the Danish coast.

Installation of substation for Sheringham Shoal Wind Farm, photo courtesy Scira Offshore Energy

Substation design for Sheringham Shoal Wind Farm

The Sheringham Shoal Wind Farm, 20 kilometres off the coastal town of Sheringham in the UK will upon completion in 2012 produce clean energy to approximately 220,000 households and contribute to a reduction of 500,000 tonnes of CO2 every year.

Model of the Hornsea One reactive compensation substation

Unprecedented substation design for Hornsea One offshore wind farm

DONG Energy Wind Power is developing the Hornsea Project One offshore wind farm in the UK. Ramboll carried out the design of a reactive compensation substation for the wind farm, as well as technical assistance during tendering, fabrication and installation.


Offshore Switchyard (OSY) design connecting multiple wind farms to the Belgian grid

In December 2016, Ramboll was awarded the detailed design contract for the offshore switchyard (OSY) for Elia’s Modular Offshore Grid in Belgian waters.

3D model of one of the substations at Changhua Wind Farm

Two HVAC transformer platforms for Greater Changhua Offshore Wind Farms

The Greater Changhua 1 & 2a offshore wind farm project is a significant step towards Taiwan’s transition to renewable energy. Ramboll designed the two large 600MW offshore substations for the wind farm.

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Oud Metha Road
PO Box 116921, Dubai, UAE
Tel:+971 4 334 3616
Fax:+971 4 334 3617


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