What happens when the wind stops blowing?

The power grid operator constantly matches the electricity generation available to electricity demand. No power plant is 100 percent reliable, and the electricity grid is designed to cope with power plants shutting down unexpectedly, and times when the wind is not blowing. Wind is variable, but predictable. Wind farm sites are chosen after careful analysis of wind patterns. This enables a forecast of output to be made – information which can be made available to the network operators who will distribute the electricity.