The above leakage current, whose mean value is 67.5 mA, describes the actual expected leakage current for this particular case study, i.e., the specified insulator with those prevailing pollution conditions mentioned in the paper. Other insulators under different conditions would produce other statistics. However, it is advisable for the electric power utility to assess the danger of a leakage-current-based insulator breakdown in a probabilistic –rather than deterministic – way. In other ways, the degree of uncertainty in predicting a flashover is to be estimated. In this case, reliance is not on the estimated mean leakage current (67.5 mA) but rather on its statistical distribution. The mean current is, therefore, not particularly marked in Figs. 6a and 6b since the distribution of risk is of value.