A wind turbine can only produce when the wind blows and therefore is not directly comparable to a conventional power plant. The capacity credit is the percentage of conventional capacity that a given turbine can replace. A typical value of the capacity credit is 25 per cent (see capacity factor).

A WT can only produce when the wind blows and, therefore, it is not directly comparable to a conventional power plant. The capacity credit is the percentage of conventional capacity that a given turbine can replace. A typical value of the capacity credit is 25% (see Capacity Factor), ie. 100 MW of wind power is assumed to replace 25 MW of conventional fossil fuelled capacity.