Some of Europe’s top economies where wind power plays a key role in electricity supply had to curtail a record amount of generation capacity between January and September as grids were unable to dispatch the surge in renewable energy output. When excess wind or solar output threatens to overwhelm grids, operators are being paid to reduce generation from their renewable energy assets. The curtailment rates in Spain, Germany, France, and south Sweden rose in the nine months of the year compared to the same period of…