(c) where an hourly notification quantity is used, it shall be applied flat to all the remaining hours of the gas day from a specified start time and shall be equal to zero for all the hours before this start time.

4. Where a locational product is traded:

(a) the transmission system operator shall determine the relevant entry and exit points or groups thereof that can be used;

(b) all the conditions specified in paragraph 3 shall be fulfilled;

(c) the originating trading participant shall modify the quantity of gas to be delivered to or off-taken from the transmission network at the specified entry or exit point by an amount equal to the notification quantity and provide evidence to the transmission system operator that the quantity was modified accordingly;

5. Where a temporal product is traded:

(a) the conditions specified in paragraph 3(a) and (b) shall be fulfilled;

(b) an hourly notification quantity shall be applied to the hours of the gas day from a specified start time up to a specified end time and shall be equal to zero for all the hours before the start time and zero for all the hours after the end time.

6. Where a temporal locational product is traded, the conditions specified in paragraph 4(a), and (c) and paragraph 5 shall be fulfilled.

7. When establishing the short term standardised products, the transmission system operators from adjacent balancing zones shall cooperate in order to determine the relevant products. Each transmission system operator shall inform the relevant trading platform operators of the result of such cooperation without undue delay.

Article 8

Balancing services

1. The transmission system operator is entitled to procure balancing services for those situations in which short term standardised products will not or are not likely to provide the response necessary to keep the transmission network within its operational limits or in the absence of liquidity of trade in short term standardised products.

2. For the purpose of undertaking balancing actions through the use of balancing services, the transmission system operator when procuring these balancing services shall consider at least the following:

(a) how balancing services will keep the transmission network within its operational limits;

(b) the response time of the balancing services compared to the response times of any available short term standardised products;

(c) the estimated cost of the procurement and use of balancing services compared to the estimated cost of use of any available short term standardised products;

(d) the area at which the gas needs to be delivered;

(e) the transmission system operator’s gas quality requirements;

(f) to what extent the procurement and use of balancing services may affect the liquidity of the short term wholesale gas market.

3. Balancing services shall be procured in a market-based manner, through a transparent and non-discriminatory public tender procedure in accordance with the applicable national rules, in particular:

(a) prior to any commitment to contract for a balancing service, the transmission system operator shall publish a non-restrictive call for tender indicating the purpose, scope and related instructions to tenderers, to enable them to participate in the tender process;

(b) the results shall be published without prejudice to the protection of commercially sensitive information and individual results shall be disclosed to each tenderer.

4. Under specific circumstances a transparent and non-discriminatory procedure other than a public tender may be approved by the national regulatory authority.