Quality of service

Terna's service quality and NTG plant performance indicators, pursuant to Resolution No. 250/04 and to the Terna Network Code, recorded performance better than or comparable with the respective targets of 2012.

  • ASA (Average System Availability of network elements) = 99.317%, performance better than the target (99.050%);
  • AIT (Average Interruption Time of the system) = 0.57 min for reasons attributable to Terna S.p.A. or to Terna Rete Italia S.r.l. (target: 1.00 min/year);
  • SAIFI + MAIFI (System Average Interruption Frequency Index and Momentary Average Interruption Frequency Index for Users directly connected to the Terna NTG) = 0.23 interruptions/user for reasons attributable to Terna S.p.A. or to Terna Rete Italia S.r.l. (target: 0.22 interruptions/user);
  • END (Energy Not Delivered owing to User blackouts) = 355 MWh for reasons attributable to Terna S.p.A. or to Terna Rete Italia S.r.l. (target: 550 MWh/year).