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A Power Control Area (PCA) refers to the power plants that are cotrolled by and feed into a single coordinated power system. A PCA functions like mini-grid within the national grid. So though you may be receiving electricity from your local utility, your utility may in turn be using its own and other power resources to accomplish the day to day supply of energy to your geographical area. The official definition reads: For utility plants, a location (operator)-based PCA includes all generating plants operated by electric generating companies whose system is dispatched by that power control area, including portions of generating plants owned by generating companies outside the control area. 'Location (operator)-based' indicates a data aggregation method based on the physical location and operation of electric power generation and emissions without respect to the ownership of that generation. Location (operator)-based aggregation is useful for environmental analysis where the physical location of a generating plant and its proximity to the power grid is important.