Imbalance Prices & Total Imbalance Volumes [17.1.G] & [17.1.H]

Imbalance Prices

Regulation Article

TR articles 17.1.g and 17.2.f

Regulation text

Imbalance prices per balancing time unit. The information shall be published as soon as possible.

Detailed description

Prices for negative and positive imbalances per ISP shall be published as soon as possible. If final prices are not available intermediate figures are published and shall be updated with final values as soon as possible.

GL EB article 55 prescribes the following:

	Imbalance price positive	Imbalance price negative
Positive imbalance	Payment from TSO to BRP	Payment from BRP to TSO
Negative imbalance	Payment from BRP to TSO	Payment from TSO to BRP

The table is applied as follows:

If the Balancing Responsible Party (BRP) has an energy deficit (i.e. negative imbalance) and the published price is positive, the BRP pays to TSO for the energy that the BRP receives.

If the BRP has an energy deficit (i.e. negative imbalance) and the published price is negative, the TSO pays to BRP for the energy that the BRP receives.

If the BRP has an energy surplus (i.e. positive imbalance) and the published price is positive, the TSO pays to BRP for the energy that the TSO receives.

If the BRP has an energy surplus (i.e. positive imbalance) and the published price is negative, the BRP pays to TSO for the energy that the TSO receives.

Specification of calculation

EB GL art. 55.3 stipulates that each TSO shall determine the imbalance price for each imbalance direction in its imbalance price area(s) for every ISP.

Imbalance prices shall be reported by default per imbalance price area, which in the majority of cases coincide with the scheduling area. The imbalance price area may differ from the scheduling area when the bidding zone covers several control areas as foreseen by GL SO article 110.2, when required by EB GL article 2(13) or when balancing markets are based on an integrated scheduling process, where local congestion within the scheduling area may influence the imbalance price.

Two different price regimes are foreseen by article 2 of the imbalance settlement harmonization methodology:

1. Single imbalance pricing; the price for positive imbalance and the price for negative imbalance are equal in sign and size.
2. Dual imbalance pricing; the price for positive imbalance is not equal to the price for negative imbalance in sign and/or size.

Articles 9.6 of the imbalance settlement harmonization methodology foresees that one or several of the following additional components may be included in the price calculation:

(a) a scarcity component to be used in nationally defined scarcity situations;

(b) an incentivising component to be used to fulfil nationally defined boundary conditions;

(c) a component related to the financial neutrality of the connecting TSO.

According to article 9.7 of the same methodology, the values of these components shall be published for those ISPs in which they were applied.

The terms and conditions published under EB GL art. 12.3.g provide the detailed explanation how the components are applied in the imbalance price calculation.

Status of data is either intermediate or final:

- intermediate when Imbalance price is not yet validated. It corresponds to the last calculated value which could still evolve

- final when Imbalance price is validated and used for imbalance settlement purposes.

Imbalance prices and additional components are expressed in currency/MWh.

Primary owner of the data

TSO/ operator of balancing market

Data provider

TSO/ operator of balancing market

Aggregation

TSO/ operator of balancing market

Publication deadline for ENTSO-E

As soon as possible

Updates

In case data is intermediate, the prices shall be updated when final values become available.

Total imbalance volume
Regulation Article		TR articles 17.1.h and 17.2.g
Regulation text		Total imbalance volume per balancing time unit … Shall be published no later than 30 minutes after the operating period
Detailed description		Two values shall be published Total aggregated volume of the imbalance D (i.e. open loop area control error, see specification of the calculation below) per ISP expressed as a single absolute value in MWh and accompanied by an explicit indicator expressing deficit, excess or balance. The difference between measured MV and scheduled flows SV over all interconnectors: MV – SV, expressed as a signed value in MWh per ISP. If final values are not available an intermediate value is published and shall be updated with final values as soon as possible (refer to Updates below). The status of the data (intermediate or final) shall also be indicated.
Specification of calculation		The error D = (MV - SV) - AR + BEx, where D = imbalance volume MV = sum of measured flows over all interconnectors SV = sum of scheduled flows over all interconnectors. It should include all planned exchanges, hence also balancing energy exchanges. HVDC ramping should not be included. AR = activated reserves within a control area/block AR = RR + mFRR + aFRR + IN - k∆f BEx = TSO-TSO energy exchange due to balancing and/or other purposes (e.g. emergency energy delivery, redispatching) IN = Imbalance Netting k∆f = frequency bias factor * frequency deviation = estimated FCR activation Calculation of AR may be based upon volumes requested for activation by TSO when metered volumes, as actually delivered by the BSP(s), are not known to the TSO by the submission deadline. AR>0 means net up regulation AR<0 means net down regulation D>0 means surplus D<0 means deficit MV>0, SV>0 means export direction MV<0, SV<0 means import direction BEx>0 means that TSO has a surplus of balancing energy compared to its local needs BEx<0 means that TSO has a deficit of balancing energy compared to its local needs With reference to GL EB article 54.6, deficit is equivalent to negative imbalance while excess is equivalent to positive imbalance. Note: By default data shall be published by imbalance area, which in the majority of cases coincide with scheduling area. Imbalance area may differ from scheduling area as foreseen under EB GL article 54.2. The following status values are foreseen: - intermediate when System Imbalance is not yet validated. It corresponds to the last calculated value which could still evolve - final when System Imbalance is validated and used for imbalance settlement purposes
Primary owner of the data		TSO
Data provider		TSO
Aggregation
Publication deadline for ENTSO-E		As soon as possible and no later than 30 minutes after the end of the ISP.
Updates		In case the data is intermediate, the figures shall be updated when imbalance adjustment (as foreseen under GL EB article 49) is known and not later than by the start of the imbalance settlement process (as foreseen under GL EB article 52).