ENTSOG BAL NC Monitoring Report 2016

3.2 INDICATOR BAL.2: TOTAL TSO BALANCING VOLUME AS % OF MARKET VOLUME

ENTSOG is of the opinion that the establishment of a residual balancing role for the TSO while leaving the primary balancing responsibility to

the network users is one of the key principles of the BAL NC.

Indicator BAL.2:

ENTSOG proposes an indicator BAL.2 which is calculated by dividing the daily total quantity of gas conducted by the TSO for balancing purpos- es through the daily total gas market entry vol- ume. This indicator gives an indication of how much gas is traded with the rest of the market by the TSO for balancing purposes compared to the market volume. The entry volumes into the bal- ancing zone (or market area) are used as the market volume. The entry volumes mean the quantity allocated at all entry points into a bal- ancing zone (or market area) including e. g. virtual IPs, LNG, productions and storages and excluding entries from the VTP.

As the TSO has the knowledge about its own traded gas volumes for balancing purposes as well as an overview of the gas entering and leav- ing the system, the data for the calculation of the indicator should be available for all TSOs. The aim of the BAL NC is to maximise the use of STSPs, where possible. As many TSOs are using balancing services or have interim measures in place, ENTSOG proposes to combine in those cases the results of indicator BAL.2 with BAL.1 in order to distinguish better between TSO bal- ancing volumes provided via the short-term wholesale market and those via other products.

INDICATOR BAL.2

DEFINITION

BAL.2: Total TSO balancing volume as % of market volume

The BAL.2 indicator is calculated [per gas day] by dividing the total quantity of gas traded by the TSO for balancing purposes following a merit order (within a balancing zone) divided by the market volume within a balancing zone. The indicator is provided for each gas day in GY 2015/2016 when TSO balancing actions occur. (Different runtimes on a yearly, quarterly and monthly basis) might be provided for the future.) If no balancing actions have been undertaken by the TSO for a gas day, the BAL.2 indicator is not calculated. Formula: Indicator BAL.2 (runtime) = Total quantity of gas traded by the TSO(s) for balancing purposes within a balancing zone (per runtime)/market volume (per runtime) [in %].

Unit

TSO balancing volume as % of market volume

Aim:

Decrease of % rate, minimised value

INPUT DATA FOR INDICATOR BAL.2 Total TSO balancing volume  1)

DEFINITION

Total TSO balancing volume is calculated as the sum of gas volumes [SELL +BUY] of all balancing products which are conducted by the TSO within a gas day following a merit order for balancing purposes. Formula: Total TSO balancing volume [in MWh/runtime/balancing zone] = ∑ volumes of STSPs [in MWh/runtime] + ∑ volumes of balancing services [in MWh/runtime] + ∑ volumes of Interim Measures [in MWh/runtime]. Market volume means the quantity allocated at all entry points into a balancing zone (or market area) including e. g. virtual IPs, LNG, productions and storages and excluding entries from the VTP [in MWh/runtime].

Market Volume

Indicator BAL.2 (per runtime) = ∑ TSO balancing volumes in MWh/runtime)/∑ market volume in MWh/runtime [in %]

Indicator BAL.2

DATA REQUIREMENTS Unit

Absolute volumes in MWh (provided per gas day)

Minimum unit

MWh (provided per gas day)

Requested data runtime

1 October 2015 – 30 September 2016 (gas day)

1 ) See also BAL.1 input data regarding the balancing products used in the formula.

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