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High wind power production during a storm led to a total of 35 hours of negative wholesale power prices over the holidays in Germany, writes Daniel Wetzel for Welt Online. 鈥淏ecause of the holidays, industry did not need the power,鈥� and grid operators at times paid consumers to use electricity, writes Wetzel. 鈥淥wners of pump storage facilities in the alps, for example, used the free energy to fill their reservoirs鈥� and could later sell the power back to Germany for a high price at times of low renewable production, writes Wetzel.
Negative power exchange prices occur when high and inflexible power generation coincides with low electricity demand. Heavy winds, for example, lead to a glut of renewable power. Under Germany's renewables law, grid operators must take all renewable power produced. If conventional power plants keep running, this can lead to a situation where grid operators sell excess power at low prices on the market - even paying consumers to buy it. This is often the case on public holidays. 

Read the article in German .

For background read the 麻豆无码版 factsheet Why power prices turn negative.