Interruptibility service

In view of the exceptional and unpredictable economic climate that triggered a sudden and considerable reduction in manufacturing activities, and, consequently, a reduction in electricity consumption, the interruptibility service underwent a number of changes in 2009. Specifically, in implementation of Authority requests, in February Terna drafted Regulations for instantaneous interruptibility service management on a monthly basis. These Regulations, which were introduced for March 2009 allocations, enabled:

  • holders of instant interruptibility contracts for the three-year period 2008-2010 to offer Terna a share of contractuallyagreed instantaneous interruptibility on a monthly basis;
  • Terna, also on a monthly basis, to reallocate instantaneously interruptible power available to parties eligible for the interruptibility service.

Below is a table of trends in monthly releases and associated reallocations, from which it is evident that during all months (bar October and November), the amount of instantaneous power available exceeded allocation demand.

DEVELOPMENTS IN MONTHLY RELEASES AND ASSOCIATED REALLOCATIONS

ANDAMENTO DEI RILASCI MENSILI E DELLE RELATIVE RIASSEGNAZIONI

Following guidance from the Authority, in July 2009 Terna amended its Regulations to extend the instantaneous interruptibility service on a monthly basis to the emergency interruptibility service (Regulations for instantaneous and emergency interruptibility service management on a monthly basis).

Below is a table presenting changes in the number of Interruptible customers and contractually-agreed power for the three-year period 2008-2010 following the allocations made in May and September.

  Interruptible
customers
at Jan. 1, 2009
Interruptible
customers at
June 1, 2009
Interruptible
customers
at Oct. 1, 2009
Contractuallyagreed
power at Jan. 1,
2009 [MW]
Potenza
contrattualizzata
al 01.06.2009 [MW]
Contractuallyagreed
power
at Oct. 1, 2009 [MW]
Instantaneous 119 123 135 3,340 3,326 3,361
Emergency 6 5 5 37 32 32
Total 125 128 140 3,377 3,358 3,393

Overall charges associated with remuneration of the interruptibility service amounted to €421 million, down 12% on the figure of €479 million recognised for the preceding year.