p a g e 8 Average vs. Extremes Thermal loads (heating and cooling) are becoming more difficult to predict given the increasing variability of weather extremes In some regions, electrification can shift reliability periods from summer to winter, complicating even the period we need to analyze in terms of reliability impacts Winter - peak events more highly variable than summer peaks and less able to be met with solar + batteries Forecasts are complicated by Technology performance trajectories Future climate changes Customer behavior (thermostat set - points, flexible load participation) Colorado 1 - 24 1 - 24 1 - 24