TenneT: North Sea is becoming the powerhouse of Northwest Europe

In: GridWindfarms
In 2020, the transmission system operator TenneT transmitted around 22.76 terawatt hours (TWh) of wind energy from the German North Sea to onshore, achieving a new record. The 2020 result exceeds the previous year's value (20.25 TWh) by 12.4 percent meeting the annual demand of around seven million households.

The share of electricity transmission from the North Sea is a strong 17.2 percent of total wind power generation in Germany, which reached 132.32 terawatt hours in 2020.

TenneT COO Tim Meyerjürgens said: "The North Sea is becoming the new powerhouse of Northwest Europe. TenneT already operates offshore grid connections in Germany and the Netherlands with a transmission capacity of around 8,500 megawatts, including more than 7,000 megawatts in the German North Sea . The German government also recognises the enormous importance of the North Sea for our electricity supply and has raised the targets for 2030 to 20,000 megawatts, of which TenneT will realise the largest part with approximately 17,000 megawatts. Added to this is the TenneT offshore grid in the Netherlands, where we will increase transmission capacity to 9,600 megawatts by 2030. All together, that's over 26,000 megawatts in 2030. We will invest 20 billion euros in the North Sea alone for this over the next few years."

In addition, TenneT plans to build a first cross-border wind power hub in the North Sea together with consortium partners by 2035, which, with 12,000 MW, will have the capacity of twelve large power plants. The hub will supply Denmark, the Netherlands and Germany with green wind power from the North Sea.

A wind power hub is a energy switching point: it aims to connect wind farms to different countries and thus simultaneously provides a direct electrical connection between these countries at a lower cost. When the wind blows, the electricity from the offshore wind farms is transported to the connected countries via the submarine cables. When winds are calm, the same submarine cables can be used to trade electricity directly between the countries.

In order to achieve the new climate policy target of 55% less CO2 by 2030, a further expansion of around 35,000 to 65,000 MW is to be expected in Germany in addition to the renewables expansion planned so far. In this context, the expansion of the electricity grid must keep pace with that of renewables.

"We have looked at the impact on grid expansion and expect up to 1,000 kilometres of additional new power lines,"
said Tim Meyerjürgens. "I believe this can be done. We will do our part and actively support the federal government in achieving these goals."

Power to X, electrolysers for the production and storage of hydrogen from green electricity as well as the coupling of the energy sectors is part of TenneT's additional power grid expansion in the future.

Meyerjürgens added: "We especially have to think very broadly about hydrogen and its integration into the energy system, much broader than before, and take an overarching, systemic approach. A key success factor will be the intelligent coupling of the different sectors and a coordinated expansion of the gas and electricity infrastructure. Only if we position and operate the electrolysers sensibly with a view to the entire electricity system can they relieve the pressure on the electricity system. Therefore, we need the right signals and incentives from politics and industry for the integration of electrolysers into the existing infrastructure so that they support the energy system and do not become an additional burden on the electricity grids."

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