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Grid Expansion Offshore


In addition to the NEP for the land sector, the TSOs also prepared an O-NEP for the North Sea and the Baltic Sea. However, the O-NEP 2030 (2017) was the last draft prepared by the TSOs. Measures taken so far in the O-NEP will now be integrated into the NEP, taking into account the previous O-NEP and the current status of the land development plan [Netzentwicklungsplan].





Depiction of the corroborated connection systems in the North Sea in O-NEP 2030

Data source: [Netzentwicklungsplan]

Depiction of the corroborated connection systems in the Baltic Sea in O-NEP 2030

Data source: [Netzentwicklungsplan]



The NEP also describes the status of implementation of the offshore grid connection systems that have been implemented or will be implemented. All offshore grid connections of the extension grid and their requirements are also presented in the respective scenarios. The NEP is prepared on the basis of the scenario framework approved by the BNetzA. The scenario framework provides for an expansion of offshore wind energy in the amount of 17 GW in scenarios B 2030 and C 2030, as well as 20 GW in scenario A 2030 [Netzentwicklungsplan].


The length of the off-shore network is 1924 km in the scenarios B 2030 and C 2030, with a transmission line of approx. 6.4 GW. The grid connection points on land were also determined for this project. The costs for the extension of the offshore grid in the scenarios mentioned above amount to € 18 billion. The sensitivity analysis carried out for the Baltic Sea shows that an increase in wind feed-in from easily accessible sources can be incorporated into the existing infrastructure without further new grid projects. This results in flexibility for the expansion of offshore wind energy in the Baltic Sea in the range of 17 GW to 20 GW in 2030 [Netzentwicklungsplan].


The aim of the Council of Europe is to achieve an interconnector capacity of 15 percent compared to the generation capacity of the respective country. In order to achieve this goal, both DC and AC connections are planned and implemented on a supra-regional basis. Some of the projects and their status will be presented below [Netzentwicklungsplan Strom 2030].


The HVDC submarine cable "NordLink" with a length of 623 km between Germany and Norway and a capacity of 1400 MW is expected to be commissioned in 2020. This will allow the Norwegian pumped storage power plants to be connected to the German electricity grid and thus facilitate the exchange of renewable energies [TenneT]. Another connection is planned with the NeuConnect project. An HVDC connection with a capacity of 1400 MW between Germany and Great Britain is to be established here. Commissioning is scheduled for 2022 [Netzentwicklungsplan Strom 2030]. With the HansaPowerBridge, an HVDC connection between Germany and Sweden is to be put into operation in 2025 and 2026 respectively. The line has a capacity of 700 MW. In addition to the Baltic Cable, which has been connecting the two countries for around 24 years, the HansaPowerBride would be the second connection of this type [Netzentwicklungsplan]; [Netzentwicklungsplan Strom 2030]; [Hansa PowerBrodge].