Interruptibility service

By Resolution ARG/elt 201/09 of 30 December 2009, in accordance with articles 30, paragraphs 18 and 32, paragraphs 8 and 9, the AEEG defined the procedures for provisioning by Terna for 2010 of resources that can be immediately interrupted:

  1. available following release of power that can be interrupted by parties financing interconnectors and by assignees of the instant withdrawal reduction service for the major islands (Legislative Decree no. 3 of 25 January 2010 converted with amendments into Law no. 41 of 22 March 2010);
  2. concerned by temporary release for quantities in line with the average annual values forecast and not, therefore, associated with a termination of contract;
  3. available by virtue of potential demands by Terna for an increase of interruptible resources, supplied overall to guarantee the safety of the system.

By virtue of this resolution, in March 2010, Terna assigned 552 MW instantly interruptible power, with validity from 1 March 2010 to 31 December 2010, against a total supply of 1,077 MW. The residual quantity, exclusively relating to shares forecast as the forecast average annual value of monthly temporary releases, has not been subsequently assigned.

Additionally, during the subsequent assignment procedures, the following were allocated:

  • 18 MW for instant interruptible service in May 2010, for the period 1 October 2010 – 31 December 2010;
  • 48 MW for instant interruptible service in September 2010, for the period 1 October 2010 - 31 December 2010.

The table attached shows the evolution of the power contracted throughout 2010 for the interruptible service, not considering the power made available for reassignment on a monthly basis, and partially reassigned.

  Interruptible
customers at
1 January 2010
Interruptible
customers at
31 December 2010
Power
assigned at
1 January 2010
Power
assigned at
31 December 2010
Instantaneous 130 145 3,361 3,302
Emergency 5 4 37 36
Total 135 153 3,398 3,338