Is wind energy really that cheap？ _energy

Wind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation and uses little land 。
The effects on the environment are generally less problematic than those from other power sources 。As of 2011, Denmark is generating more than a quarter of its electricity from wind and 83 countries around the world are using wind power to supply the electricity grid 。
In 2010 wind energy production was over 2 。5% of total worldwide electricity usage, and growing rapidly at more than 25% per annum 。
Wind power is very consistent from year to year but has significant variation over shorter time scales 。As the proportion of windpower in a region increases, a need to upgrade the grid, and a lowered ability to supplant conventional production can occur 。
Power management techniques such as having excess capacity storage, geographically distributed turbines, dispatchable backing sources, storage such as pumped-storage hydroelectricity, exporting and importing power to neighboring areas or reducing demand when wind production is low, can greatly mitigate these problems 。
【Is wind energy really that cheap？】In addition, weather forecasting permits the electricity network to be readied for the predictable variations in production that occur 。

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