Provisioning of resources

As part of the gradual introduction of the definitive electricity market rules, the Authority for Electricity and Gas issued ARG/elt Resolution no. 203/08 on December 23, 2008, establishing that it will not reintroduce the possibility for Terna to operate on the Day Ahead Market except in response to exceptional difficulties in the national electricity system.
Terna had used this possibility to correct divergences between the total demand of consumers on the Day Ahead Market and Terna's own demand forecasts. As from January 1, 2009, however, Terna has been balancing demand by recourse to the Ancillary Services Market.
Terna operated on the Ancillary Services Market during the scheduling phase, which is held on the day prior to that of the actual flow, buying about 12.5 TWh and selling about 14.8 TWh of energy (respectively 11.6 TWh and 11.5 TWh in 2008, corresponding to an increase of 8% and 29%), for a net outlay of €1,385 million (€1,8611 million in 2008, down 26%).
Despite changes in the regulatory framework, the 4.2 TWh increase in overall Ancillary Services Market volumes was far below the volumes traded in 2008 on the Day Ahead Market (11.3 TWh). This effectively large reduction in volume also reflects the effectiveness of Terna’s various actions to reduce/optimise provisioned dispatch resource volumes.
The reduction was recorded during real-time equalisation of the Ancillary Services Market, where the volumes bought and sold up to November were, respectively, 7.1 TWh (down 19% compared with the same period in 2008, when the figure totalled 8.8 TWh) and 9.7 TWh (down 8% compared with the 2008 figure of 10.6 TWh), for a net charge of €384 million (down 49% on the 2008 figure of €760 million).

(1) Total inclusive of charges associated with term contracts for dispatching services signed in 2008.

Approvigionamento delle risorse

Overall costs in fees for dispatching resources provisioning (inclusive of term contracts for 2008) registered a reduction of €852 million over the period taken into consideration.
After the real-time phase, Terna verifies the proper execution of commercial obligations by the market participants, both in terms of generation and demand. To that end, the measurements at each point of input and withdrawal are taken, with the help of the distribution firms, and the differences from the schedules are calculated. These differences (imbalances) are measured using algorithms established by the regulatory framework. The net charge resulting from the measurement of these imbalances and of the buying and selling transactions executed by Terna on the Day Ahead and Ancillary Services Markets are billed on a pro rata basis to each consumer with the uplift fee.

Approvigionamento delle risorse