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For most electricity generators, availability is the same as [[Capacity factor|capacity value]], i.e., the percentage of time that a plant can be reliably called on to provide power in response to demand. | For most electricity generators, availability is the same as [[Capacity factor|capacity value]], i.e., the percentage of time that a plant can be reliably called on to provide power in response to demand, i.e. how much of the time it is not shut down (e.g., for maintenance or repair). | ||
Wind turbines, on the other hand, have a capacity value of zero, yet they are typically “available” over 90% of the time. However, they are available only to the wind (should it blow), not the actual needs of the grid. | Wind turbines, on the other hand, have a capacity value of zero, yet they are typically “available” over 90% of the time. However, they are available only to the wind (should it blow), not the actual needs of the grid. |