Earth Hour -- Did it work?

The graph below is from www.caiso.com, the California Independent System Operator. CAISO is in charge of receiving power from power generating plants, and distributing the power throughout the state grid to the various end users.

Below are graphs for Saturday (earth hour 830pm) and Sunday (no earth hour)

The light gray line is the forecasted power usage, shown in Megawatts. The red line is the actual power consumed. There was no apparent decrease in the power load throughout the state, from 8:30 to 9:30 p.m.