Technicalities Because of the lack of security in the presence of wind, wind energy can not be used as the sole source of electricity. Therefore, to save the “valleys” in the production of wind energy is indispensable support of conventional energy (coal-fired or combined cycle, for example, and more recently of clean coal). However, when supporting the wind, coal plants can not operate at its optimum performance, which is close to 90 of its power. They have to stay well below this percentage, to significantly raise its production by the time they loosen the wind. Therefore, in the “backup” power plants consume more fuel per kWh produced. Also, by raising and lowering its output whenever the wind speed changes, wears more machinery.This problem goes back to Spain to try to resolve through an interconnection with France that enables use of the European system as a cushion of wind variability. Wind farm at Tehachapi Pass, California In addition, variability in wind energy production has 2 important consequences: To evacuate the electricity produced by each wind farm (which are usually located in natural areas also paragraphs) is necessary to build high voltage lines capable of driving the maximum power that is capable of producing the installation. However, the average drive voltage is much lower. This means putting 4 times thicker wires, and often taller towers to accommodate peak wind correctly. There needs the wind dips “instantly” (increasing the production of thermal power plants) because it is so produced, and in fact widespread blackouts occur by reduced blood pressure.This problem could be solved by storage devices power. But the electricity produced is stored: it is instantly consumed or lost. In addition, other problems include: Technically, one of the major drawbacks of wind turbines is called voltage dip. Faced with one of these phenomena, the protections of wind turbines with squirrel cage motors are disconnected from the network to avoid being damaged and therefore cause further disruptions in the network, in this case, lack of supply. This problem is solved either by modifying the switchgear of arogeneradores, which is rather costly, either by using synchronous motors. One of the major drawbacks of this type of generation, is inherently difficult to predict the generation in advance.Since power systems are operated by calculating the generation with a day in advance in view of expected consumption, the unpredictability of wind poses serious problems. Recent advances in wind forecasting has greatly improved the situation, but it remains a problem. Similarly, groups of wind generation can not be used as a knot swinging. Besides the obvious need for a minimum wind speed needed to move the vanes, there is also an upper limit: a machine can be generating at full power, but if the wind increases just enough to exceed the specifications of the mill, is required to disconnect the circuit from the network or change the tilt of the blades to stop turning because of high wind speeds the structure can be damaged by the efforts that appear on the shaft.The immediate consequence is a clear decline in electricity production, despite an abundance of wind, and another factor of uncertainty when it comes to having energy in the consumer electricity grid.