The situation is different in the United Kingdom (UK). The wind farm developers are also responsible for the construction of the grid connection there. When the offshore grid connection is ready, they sell it to commercial investors and a so-called OFTO is formed; the Offshore Transmission Owner.
Which model, the TSO model or the OFTO model, ensures the lowest costs for electricity consumers, i.e. for society? DNV-GL mapped this out. Main conclusions by DNV-GL: In the OFTO system (UK), the costs of developing offshore connections (CAPEX) are significantly higher than in the Netherlands and Denmark.
Furthermore, DNV-GL's report shows that the LCOE1 (Levelized Cost of Energy) of the Dutch and Danish offshore connections is quite a bit lower.
You can download DNV-GL's presentation with results here.
Next week, Navigant will present a further analysis. The analysis also highlights other than financial-economic benefits of the TSO model. Think of the coordination when it comes to integrating offshore wind energy into the onshore grid and the responsibility during the operational lifetime.