You never hear politicians promise that hurricanes and tornadoes won’t hurt you, that you won’t get wet (or flooded) when it rains, that protracted heat waves won’t endanger anyone or that urban fires are no threat during droughts. That would be nuts. But after the storm that left Texans across the state freezing in the dark last February, the state’s leaders are promising now that the winter just ahead of us won’t cause any electric blackouts.