CAIFI (Customer Average Interruption Frequency Index): The average number of interruptions per customer interrupted per year. 1.70 1.40 0.99 109.98 110.69 1.79 20162015 1.23 0.86 92.30 106.82 1.73 2014 20 2016 Corporate Responsibility & Sustainability Report Fueled by the severe, ongoing drought, 2016’s fire season featured several significant wildfires around our region resulting in major power outages, and in each case, SCE was challenged to restore power as quickly as possible.