What is the project about?
Every TSO in Europe (coordinated under the umbrella organisation ENTSO-E) is responsible for maintaining the balance between injection and offtake (including import and export) in their control area. Discrepancies between injection and offtake create imbalances that have to be resolved by the system operator. Elia has established a balancing mechanism that uses power reserves, i.e. back-up capacity supplied by grid users, to correct such imbalances. In addition, market parties are given an ‘imbalance tariff’ as an incentive to balance their own portfolio or help to correct system imbalances.
Even after the activation of reserves, an imbalance may still remain: the area control error (ACE), which is the difference between the system imbalance and the net volume of activated reserves or net regulation volume (NRV).