ENTSOG Implementation and Monitoring Report 2017 - Balancing Network Code

INDICATOR BAL.4

DEFINITION

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. Formula: Indicator BAL.4 = ∑Net imbalance volumes of shippers/market volume

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

Unit

Shippers’ imbalance volume as % of market volume

net imbalance volume of shippers equals net TSO balancing volumes, converge to zero

Aim

2.3.2 Presentation of the results

The daily BAL.3 indicator is compared to the daily BAL.4 indicator. Both indicators should be minimised and should have a limited range. Where differences of the two indicators per balancing zone/ country occur, further explanation might be needed to understand better how the system is overall balanced by the TSO on a daily basis. An example of BAL.3 in a balancing zone with general explanations related to the graph can be found in Map 5 below. It shows the range and the fluctuation of the net TSO balancing volumes conducted by the TSO at the end of the day relatively to the daily market volume in a balanc- ing zone or a trading region (e. g. TRS). The maximum range of the relative net TSO balanc- ing volumes is limited with the minimum and maximum of the performed TSO volume at the end of the day. The blue box indicates the range in which the TSO is performing 80% of its balancing volumes relatively to the market (entry) volumes of a balancing zone.

An example of the indicator BAL.4 in a balancing zone with general explanations related to the graph can be found in Map 6 on the next pag. It shows the range and the fluctuation of the net shipper imbalance volumes on a daily basis taken into account those days when shipper imbalances occur during GY 2016/2017. The maximum range of the relative net shipper imbalance volumes is limited with its minimum and maximum volumes during the aforemen- tioned period. The orange box indicates the range of the net volume of shipper imbalances relative to the market (entry) volume of a balanc- ing zone (BAL.4) on 80% of the days when any shipper imbalances occur.

25%

20%

Max

On the remaining 10% of the days when TSO is performing balancing actions, the net TSO balancing volumes relative to the market entry volume of a balancing zone (BAL.3) have a range between +5% and max. +15%. This means on 10% of the days when the TSO is performing balancing actions, he is selling (more) gas to the market at the end of the day in a range of 10%.

15%

On 80% of the days when TSO is performing balancing actions, the net TSO balancing volumes relative to the market entry volume of a balancing zone (BAL.3) have a range between −5% and +5%. This means that the TSO is sometimes selling more gas (+) to the market as well as sometimes buying gas (−) more from the market at the end of the day in a range of 10%.

10%

5%

0%

On the remaining 10% of the days when TSO is performing balancing actions, the net TSO balancing volumes relative to the market entry volume of a balancing zone (BAL.3) have a range between min. −15% and −5%. This means on 10% of the days when the TSO is performing balancing actions, he is buying (more) gas from the market at the end of the day in range of 5%.

– 5%

– 10%

– 15%

Min

– 20%

Balancing zone (no. of days with TSO bal.action)

Map 5:   Example with explanation of the daily BAL.3 indicator in % on days with TSO balancing actions in GY 2016/2017

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