A load duration curve (LDC) is used in electric power generation to illustrate the relationship between generating capacity requirements and capacity utilization.

A LDC is similar to a load curve but the demand data is ordered in descendingorder of magnitude, rather than chronologically. The LDC curve shows the capacity utilizationrequirements for each increment of load. The height of each slice is a measure of capacity, andthe width of each slice is a measure of the utilization rate or capacity factor. The product of thetwo is a measure of electrical energy (e.g. kilowatthours).

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