The problem with wind turbines is that they only produce power when the wind is blowing, providing, of course it is not blowing too hard. So when it is very cold and demand for power is at its highest wind turbines are often inactive because cold weather is usually associated with very still weather conditions.
More importantly wind speeds can vary enormously minute to minute and the resulting power surges are very difficult for the electricity grid to handle increasing the possibility of a grid collapse, when large areas of the country could end up with no power at all until one of the good old-fashioned power stations can get its black start generators going and start restoring supply.
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