Global Blockage Effect in Offshore Wind (GloBE)

Understanding how the wind flows through, over and around large offshore wind farms.

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GloBE project

The Global Blockage Effect (GBE) has become a hot topic in offshore wind in recent years. While there is a broad industry consensus that the GBE causes decelerations in front of offshore wind farms which reduce the energy yield, different opinions exist on how to consider its downstream impacts and how to account for redistribution of energy, for example. This is commercially relevant as uncertainty in wind farm performance drives a high cost of capital for offshore sites. Any over estimation of the GBE leads to the de-valuation of offshore wind projects.

The GloBE project aims to:

  • Measure the decelerations and accelerations of the wind around the Heligoland windfarm cluster 
  • Understand their sensitivity to atmospheric parameters such as the height of the boundary layer
  • Test various hypotheses and modelling approaches against the measured data
  • Build an industry consensus around how blockage should be modelled and how the corresponding uncertainty should be assessed

This should allow offshore wind developers to reduce the uncertainties assigned to blockage effects, making it easier to finance the construction of new offshore wind farms.

Scheduled completion

September 2022

Budget

€3.9m including in-kind contributions

Lead Partner

RWE

RWE logo
Partners

EDF Renouvelables, EnBW, Equinor, Ørsted, Shell, ScottishPower Renewables, Vattenfall, Leosphere and the Technical University of Denmark

Globe partners
Setup under

Offshore Wind Accelerator (OWA)

Contact
Neil Adams logo

Neil Adams, Project Manager, neil.adams@carbontrust.com 

Related

Offshore wind industry consortium gears up to conduct first of a kind full-scale measurement campaign focused on ‘Global Blockage Effect’