Europe’s drive toward a power system based on renewable energy has gone so far that output will probably need to be cut within months because of oversupply. Network operators are likely to curb solar and wind generation at times of low demand to prevent overloading the region’s 188,000 miles (302,557 kilometers) of power lines, Entso-e, the grid association in Brussels, said last month. Renewable output is poised to almost double to 18 percent by 2020, according to Energy Brainpool GmbH & Co. KG, a consulting firm in Berlin.
http://www.bloomberg.com/news/2014–06–05/europe-faces-green-power-curbs-after-fivefold-expansion-energy.html