Imbalance settlement is a clearing of balance groups within which the amount of imbalances is determined and calculated by comparing the entire realisation of balance groups and their market plan. Besides the amount of imbalances, clearing also includes the financial values of imbalances.
The Market Operator prepares a market plan for each accounting interval (1 hour) according to recorded closed contracts. A market plan is a plan for the net position of an individual Balance Scheme Member on the organised market and is an outcome of all closed contracts concluded by a Balance Scheme Member and hierarchically inferior members of the Balance Scheme.
In each accounting interval, the market plan of the Balance Scheme Member, who acts as a supplier on the market, is equal to its total consumption or generation of electricity. Balance Scheme Members who act as traders on the market and have no appurtenant delivery points have a market plan that equals 0 MWh in all accounting intervals.
The imbalance settlement is comprised of two parts: The first is the so-called quantitative settlement in which data on realisation and market plan are acquired, on the basis of which the imbalances of balance groups are calculated. The Market Operator receives data on realised values of production and consumption of all delivery points from Distribution System Operators and Transmission System Operator.
Balance Scheme Members are also included in the procedure of imbalance settlement, since the Market Operator stays in constant touch with them for the purpose of preparing the quantitative settlement. Balance Scheme Members check their own quantitative settlement and in case of incorrect data, they are allowed to raise an objection. On its basis, the Market Operator and System Operators verify data and produce a new quantitative settlement, if necessary.
For the second part, the Market Operator produces a final monthly imbalance settlement for an individual Balance Group on the basis of confirmed quantitative settlement. The following activities fall within the imbalance settlement:
- The calculation of the tolerance band of a Balance Group;
- Determination of basic prices of imbalances (C+ and C-);
- The calculation of the amount for imbalance settlement inside and outside of the tolerance band.
After the accounting year is completed, the annual recalculation of imbalance settlement is prepared. The annual recalculation is calculated due to the presence of delivery points that do not execute measurements in each quarter of an hour and for which consumption in the Balance Scheme is estimated on the basis of an analytical procedure during the year.
For the delivery points without registration meters or for those that have a registration interval longer than the accounting interval of 1 hour ("non-measured consumers"), the realised consumption or supply in an individual accounting interval shall be determined with an analytical procedure.
Within the analytical procedure, the calculation of non-measured consumers in an individual accounting interval is carried out using the data of the residual diagram of each distribution area’s consumption, which is divided among consumers on the basis of non-measured consumption quotients.
Differences that occur between actual (invoiced) quantities and quantities from the analytical procedure are calculated within annual recalculat