The situation is different in the United Kingdom (UK). There, the wind farm developers are also responsible for the construction ('developer build') of the grid connection. When the offshore grid connection is ready, they sell it to commercial investors and a so-called OFTO is formed; an Offshore Transmission Owner.
On 1 July, Navigant published a study (commissioned by TenneT and the French TSO RTE) comparing the 'TSO Build' and 'Developer Build' models. Which model, the TSO model or the 'Developer Build' model, ensures the lowest costs for electricity consumers, i.e. for society? And which model offers the most qualitative benefits?
The TSO model is favourably presented in the Navigant study. In addition to lower social costs, the TSO model also offers advantages in terms of system integration, security of supply and ecological impact. Think of the coordination when it comes to integrating offshore wind energy into the onshore grid, the responsibility during the operational lifetime and the lowest possible impact on nature during the construction of the offshore grid.
These findings are in line with the report published by DNV-GL on 24 June. This study maps out the costs of grid connections. DNV-GL's main conclusions are that the costs of developing offshore connections (CAPEX) in the OFTO ('developed build') system (UK) are considerably higher than in the Netherlands and Denmark. In its report, DNV-GL also shows that the LCOE1 (Levelized Cost of Energy) of the Dutch and Danish offshore connection systems is lower.