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Article 21 Daily imbalance quantity calculation

United Kingdom

Original text. Later amendments are not shown.

1.

The transmission system operator shall calculate a daily imbalance quantity for each network user’s balancing portfolio for each gas day in accordance with the following formula:

daily imbalance quantity = inputs – off-takes

2.

The daily imbalance quantity calculation shall be adapted accordingly where:

(a)

a linepack flexibility service is offered; and/or

(b)

any arrangement is in place whereby network users provide gas, including gas in kind, to cover:

  1. (i)

    gas unaccounted for as off taken from the system, such as losses, metering errors; and/or

  2. (ii)

    gas used by the transmission system operator for the operation of the system, such as fuel gas

3.

Where the sum of a network user’s inputs for the gas day is equal to the sum of its off-takes for this gas day, a network user is deemed balanced for this gas day.

4.

Where the sum of a network user’s inputs for the gas day is not equal to the sum of its off-takes for this gas day, a network user is deemed imbalanced for this gas day and daily imbalance charges shall be applied in accordance with Article 23.

5.

The transmission system operator shall provide a network user with its initial and its final daily imbalance quantities in accordance with Article 37.

6.

The daily imbalance charge shall be based on the final daily imbalance quantity.