Although the overall average margins are well above 40%, the margin for each hour in a given period must be calculated. This shifts the focus from all hours of the year to the hours in which the margin is the lowest. These are the hours in which there may not be enough system resources to meet demand.
The 10 days with at least one of the lowest margin hours for each region are shown on the scatter plot. The variability pages will use these days to show how risk is analyzed through probabilistic resource adequacy.
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.
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