With a view to ensuring the proper management of the system, CTEEP keeps a consistent monitoring of the Equivalent Frequency of Interruptions (FREQ), an indicator that measures the number of times that maximum demand experiences interruption during the monitoring period, as well as the Equivalent Duration of Interruptions (DREQ), which reflects the equivalent time of interruption in the maximum demand measured during the monitoring period.

The Company`s losses from power transmission are very low, estimated at 1%. In 2012, the ratio of frequency interruptions showed a decline, whereas duration resulted slightly higher, year-over-year, as shown in the table below: