IEA Wind Task 26: Offshore Wind Farm Baseline Documentation

Aaron Smith, Gavin Smart, Iver Sperstad, Bob Prinsen, Roberto Lacal-Arantegui, Ethan Warner

Research output: NRELTechnical Report


This document has been produced to provide the definition and rationale for the Baseline Offshore Wind Farm established within IEA Wind Task 26--Cost of Wind Energy. The Baseline has been developed to provide a common starting point for country comparisons and sensitivity analysis on key offshore wind cost and value drivers. The baseline project reflects an approximate average of the characteristics of projects installed between 2012 and 2014, with the project life assumed to be 20 years. The baseline wind farm is located 40 kilometres (km) from construction and operations and maintenance (O&M) ports and from export cable landfall. The wind farm consists of 100 4-megawatt (MW) wind turbines mounted on monopile foundations in an average water depth of 25 metres (m), connected by 33-kilovolt (kV) inter-array cables. The arrays are connected to a single offshore substation (33kV/220kV) mounted on a jacket foundation, with the substation connected via a single 220kV export cable to an onshore substation, 10km from landfall. The wind farm employs a port-based O&M strategy using crew-transfer vessels.
Original languageAmerican English
Number of pages37
StatePublished - 2016

NREL Publication Number

  • NREL/TP-6A20-66262


  • cost of wind energy
  • IEA Task 26
  • International Energy Agency
  • NREL
  • offshore wind


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