Borssele Beta Offshore High Voltage Substation - 700 MW

The Offshore High Voltage Substation (OHVS) Borssele Beta (jacket and topside) is required to link up the wind farms to be built offshore in the South-West section Borssele 3 & 4areas of the Dutch North Sea. HSM Offshore also acquainted the order for Tennet’s first offshore wind energy project, Borssele Alpha (700 MW). The Borssele Alpha and Beta projects are the first large-scale grid connections to be constructed under the National Energy Agreement for offshore wind farms in The Netherlands. The scope covers engineering, procurement, construction, transport, installation, connection and testing of the OHVS. The Borssele Alpha and Beta OHVS will be the largest AC substations in the world.

  • LocationDutch North Sea
  • DimensionsTopside 58x32x26 metres
    Jacket 37x35x57.5 metres
    Piles 61 metres each
  • WeightTopside 3700 tonnes
    Jacket 2950 tonnes including cable deck
    and J-tubes
    Piles 1400 tonnes
  • CapacityTotal Power 700 MW (2x350 MW)
    Intake Voltage 66 KV
    Export Voltage 220 kV
  • Contract AwardSeptember 2017
  • CompletionAugust 2020
  • ContractEPCIC
  • ClientTenneT TSO BV
  • Consultant/EngineerIv-Offshore & Energy / Joulz


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HSM Offshore - Borssele Beta OHVS (TenneT)
HSM Offshore - Borssele Beta OHVS (TenneT)
HSM Offshore - Borssele Beta OHVS (TenneT)