# Commission Regulation (EU) No 312/2014 of 26 March 2014 establishing a Network Code on Gas Balancing of Transmission Networks (Text with EEA relevance), Article 21: Daily imbalance quantity calculation

Extent: E+W+S+N.I.

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:
(i) gas unaccounted for as off taken from the system, such as losses, metering errors; and/or
(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.

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Source: https://www.legislation.gov.uk/eur/2014/312/article/21 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-312/article-21
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.