Abstract
Since 1995 the Norwegian regulator has required annual reporting of interruption data by the network companies. Main results from the reported data in 1995-1999 are presented in the paper. The statistics shows that the annual number of interruptions per delivery point has been relatively constant during this five-year period. The annual energy not supplied (ENS) shows a decreasing tendency due to a quite evident reduction in ENS for notified interruptions. The interruption statistics is utilized for many purposes by the regulator, the network companies and as a basis for research. Some examples of utilization of the statistics are presented in the paper. © 2001 IEEE