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Capacity credit of wind power

Capacity credit is the measure for firm wind power

The contribution of variable-output wind power to system security, that is the capacity credit of wind, is estimated by determining the capacity of conventional plants displaced by wind power, whilst maintaining the same degree of system security, i.e. unchanged probability of failure to meet the reliability criteria for the system. Alternatively, it is estimated by determining the additional load that the system can carry when wind power is added, maintaining the same reliability level.

Many national wind integration studies have been giving the capacity credit of wind special attention, as in some ways it is a ‘synthetic’ indicator of the potential benefit of wind as a generator in the system. Sometimes the capacity credit of wind power is measured against the outage probabilities of conventional plants.