Road Map

Combining the demand and resource availability distributions shows the range of margin uncertainty in any given hour. The expected margin is the difference between the peaks of the distributions. However, variability in distribution leads to variable margins. When the distributions overlap, the area has possible negative margins; meaning the availability from the resources is less than the expected demand for that hour. In those cases, an area must import energy to meet demand.

Page Tip

Clicking a region on the map will change the charts to show that area's information. Clicking the same area again will switch the charts back to the overall Western Interconnection results.

Click one of the low-margin days on the scatter plot. The following chart will show the hourly expected profile for that day.