The load percentages for the different seasons is shown below. I haven't been able to get the winter season yet. The reason that the totals do not add up to 100% is that I also used eth DC ties in the load analysis, it only introduces a very small error.
% of total load
North South West Reliant
Spring Case 31.96% 26.93% 5.94% 34.74% 99.57%
Summer Case 38.34% 24.70% 5.62% 31.03% 99.69%
Fall Case 34.33% 26.93% 5.86% 32.50% 99.61%