By selecting separate regions from the map, you can see specific trends associated with the different sub-regions within the Western Interconnection. Different combinations of BAs can be selected from the drop-down chart.
Note: When a sub-region is selected from the map, the list of BAs in the drop-down list corresponds to the BAs in that region. If there are selections in the BA list, only the regions of the map with a BA in the list are selectable.
To reset the map, select the highlighted region a second time. To reset the BA list, either “x out” of the BA(s) selected or hit the eraser button.
Click on the arrows connecting sub-regions to see the distribution of power flows between those sub-regions in each quarter over several years.
Histograms portray the historical frequency of exchange flows between sub-regions for different quarters of the calendar year. Positive values correspond to flow in the direction indicated by the label on the x-axis. Negative values correspond to flows in the opposite direction.