The share of North Sea offshore electricity in Germany’s total wind power generation increased by 13% year on year in 2025, reaching 15.7% of national output, according to the latest figures published by TenneT Germany, the country’s transmission system operator.

In absolute terms, TenneT Germany transmitted 20.8 terawatt hours (TWh) of offshore wind power from the German North Sea to the mainland in 2025, enough to cover the annual electricity demand of around 6.5 million households, the company said.

Although total output in TWh remained broadly in line with 2024 levels, the higher share within the national wind mix reflects the growing role of offshore wind, amid a slight decline in Germany’s overall wind generation, which fell from 138.3 TWh in 2024 to 132.6 TWh in 2025, according to official data.

Overall, Germany’s total offshore wind generation reached 26.1 TWh in 2025, of which 20.8 TWh came from the North Sea, within TenneT Germany’s grid area, and 5.38 TWh from the Baltic Sea, operated by transmission system operator 50Hertz.

TenneT Germany CEO Tim Meyerjürgens highlighted the strategic importance of the North Sea for Europe’s energy transition. “Europe now has the opportunity to unlock the full potential of the North Sea as a green power plant. This potential is the most important building block for a secure, independent and energy-resilient Europe,” he said.

Meyerjürgens added that North Sea countries are already working on planning and implementing a cross-border, interconnected offshore energy system to accelerate large-scale renewable deployment. “At TenneT Germany, we have been driving this development forward for years and stand ready to help deliver the North Sea power plant project,” he said.

From a technical perspective, TenneT Germany’s offshore transmission capacity reached 9,832 megawatts (MW) in 2025, while installed offshore wind capacity in the German North Sea stood at 7,905 MW, up from 7,387 MW a year earlier.

The highest offshore feed-in level of the year was recorded on 30 December, when output peaked at 6,543 MW, underlining the increasing integration of offshore wind into Germany’s power system.