4 Monthly Dispatch Hydro regulator determines available hydro Hydro divided into blocks (URC, etc.)Dispatch order of hydro blocks wrt thermal resources based on user input prices
5 Window DispatchDetermines if system used flexibility in hourly dispatch from last windowForecasts how much hydro will use in next window (including flex) and determines the order the discretionary hydro will have in the dispatch compared to other resources
6 Day DispatchForecasts amount of hydro that will be needed in the next dayShapes the day’s hydro energy in to hours based on the load shape, sustained peaking limits, and off peak minimums
7 Hourly DispatchAmount of hydro available comes from the day dispatch hourly shaping logicOrder of hydro in the dispatch (i.e. shadow price) comes from the window dispatchResources and loads specified by nodeResources meet within node loads firstEconomic transactions done between nodes, taking into account transmission
8 Flexibility 1) Running monthly ave. hydro dispatch 2) Monthly hydro down to firm rightsIf 1) exceeded 2) in the previous window, the difference is the amount of flexibilityAmount of flex can not exceed user inputAs long as the system is flexing, the hydro shadow price is at the flex hydro price
9 Flexibility Example February 1929 Monthly Hydro Energy to Firm Rights = MWaWindow Running Average Hydro Dispatched Flex AmountMWa MWhMWa MWhMWa MWhMWa MWh.MWa MWhAt the end of the month the hydro regulator is rerun and the flex amount is set back to zero. The regulator made up 256 MWa of flex at the end of this month.
10 Off-Peak Purchase Logic User may specify an amount and the hours of availability of off-peak purchasesIf the system is forecasted to need flex in the next window, the off-peak purchases will be made available to the hourly dispatch. Otherwise, they are not available.