Table 4 shows the maximum values of ton that one can have during each time of the day, assuming the ASHRAE Wd schedule, as one changes Td from an initial value, either 120 °F or 100 °F, to 140 °F. Tdb = 120 °F is the base case, when one does not expect the need to take or drop power during the next few hours. However, if one knows that there will be a need to take as much load as possible, due to a typical surge in production of wind power or due to a decrease in the regular electric load in the system, then one could operate with Td = 100 °F.