Borssele Alpha Offshore High Voltage Substation - 700 MW

The Offshore High Voltage Substation (OHVS) Borssele Alpha (jacket and topside) is required to link up the wind farms to be built offshore in the South-West section Borssele 1 & 2 areas of the Dutch North Sea. HSM Offshore is also partner for TenneT’s next offshore wind energy project, Borssele Beta (700 MW).

The Borssele Alpha project, together with the Borssele Beta project, 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 35x29x50 metres
    Piles 61 metres each
  • WeightTopside 3700 tonnes
    Jacket 2900 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 AwardFebruari 2017
  • CompletionAugust 2019
  • ClientTenneT TSO BV
  • ContractEPCIC
  • Consultant/EngineerIv-Oil & Gas / Joulz


Back to overview

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