Readers react to our detailed report on why Avista issued rolling blackouts during the record-breaking June heatwave. Patrick Hayes: The 1-in-100 event predictions seem to be based on more stable climate models. My friend in Houston has now had several 1-in-500 events in the past five years and several more 1-in-100. We shouldn t expect anything different here. In addition to system loads, grid operators must consider physical damage to the grid . Wildfire, primarily. Much of our generating capacity is in the hands of the Feds with responsibilities far beyond the PNW. Bottom line? How much are ratepayers willing to pay for reliable power which may no longer be cheap? It s not Avista s sole responsibility.