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This paper describes a methodology to evaluate the amount of required regulation and load following capability to maintain reliability in the CAISO Control Area. The methodology is based on a mathematical model of the CAISOpsilas actual scheduling, real-time dispatch and regulation processes. The forecast load and wind power are stochastic quantities, represented by two series of minute by minute values: the load/wind-power average value and its standard deviation magnitude. The hour-ahead wind generation forecast was assumed to be a part of the future CAISO/scheduling coordinator (SC) scheduling system. CAISO actual 2006 data and simulated 2010 data are analyzed by season. Load following and regulation requirements, including the capacity, ramping, and duration requirements by operating hour within a season of 2006 and 2010 were analyzed simultaneously.