ENTSOG BAL NC Monitoring Report 2016

3.4 INDICATOR BAL.4: NET SHIPPER IMBALANCE VOLUME AS % OF MARKET VOLUME

ENTSOG proposes an indicator which is calcu- lated by dividing the total daily net imbalance volume of shippers  2) through the market volume (within a balancing zone). This indicator aims at assessing whether the overall system is in balance on a day-on-day principle and whether the network users con- tribute sufficiently to keeping the overall system in balance. ENTSOG suggests using aggregated portfolio data to assess whether network users contribute sufficiently to keeping the overall

system in balance. The BAL.4 indicator is used in combination with BAL.3 in order to compare relatively the net imbalance volume of shippers and the counteracting net balancing volume of the TSO. 2) As per Article 21 BAL NC the imbalance quantities shall be calculated by the TSO as a daily imbalance quantity for each NU’s portfolio for each gas day.

INDICATOR BAL.4

DEFINITION

BAL.4: Net imbalance volume of shippers as % of market volume

The BAL.4 indicator is calculated on a daily basis by dividing the total net imbalance volumes of shippers [long and short] at the end of gas day by the market volume at the end of gas day. The indicator might be provided for different runtimes in the future. Formula: Indicator BAL.4 (runtime) = ∑Net imbalance volumes of shippers (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.4 Net imbalance volume of shippers

DEFINITION

The net imbalance volume of shippers is calculated as the sum of the imbalance values of all shippers that are long at the end of the gas day (positive value) and the sum of the imbalance values of all shippers that are short at the end of the gas day (negative value). Formula: Net imbalance volume of shippers [in MWh/runtime] = ∑Imbalance volume [LONG] of shippers [in MWh/runtime] + ∑ Imbalance volume [SHORT] of shippers [in MWh/runtime].

Market volume means the quantity allocated at all entry points into a balancing zone (or market area)  1) including e. g. virtual IPs, LNG, productions and storages and excluding entries from the VTP [in MWh/runtime].

Market Volume

Indicator BAL.4

Indicator BAL.4 (runtime) = ∑ Net imbalance volume of shippers (per runtime)/market volume (per runtime) [in %].

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) In France.

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