Onshore and offshore wind turbines fed an all-time record of 32.6GW into the German grid on Wednesday, according to transmission operator TenneT said.
The high output forced transmission system operators to apply costly measures in order to stabilise the grid.
Since 9 November, TSOs have had to curtail 300MW of wind capacity and call up a daily amount between 200MW and 2.2GW of Germany’s winter reserve capacity to stabilise the grid.
Such measures will cost electricity users about €500m this year, TenneT said.
TenneT’s Urban Keussen said: “In order to be able to feed in and transport rising amounts of electricity from wind and other renewable energies without disruption, the expansion of the power grid in Germany is indispensable.
“If the grid expansion is delayed, consumers and the economy will continue to carry high costs for emergency measures, and the risks for the security of supply will rise.”
Image: Hörup wind farm in Germany (RWE)
