Regulation (aka. Automatic Generation Control) is the last minute true-up between supply and demand in a Balancing Authority Area. The objective of Regulation in a multi-BA interconnection is to maintain the Area Control Error within acceptable bounds of magnitude and character. Resources that are assigned to provide Regulation follow a centrally sensed and calculated AGC setpoint. It is important to have a reasonably good estimate for the amount of Regulation that will be required in any given time-period in order to assign enough resources to this task. There are several variables influencing the required Regulation capacity, which makes the analysis somewhat complicated. To date ISO New England uses a graphical retrospective analysis for this task. Matlab’s analysis and visualization capabilities are useful in this context.