Your day-to-day transmission

GRTgaz calculates your operational capacity for each gas day based on the capacities subscribed. By 2.30 p.m. on the day before, you know the state of your capacities portfolio for the following gas day for the different contractual points.

>> Operational diagram of the network with coded points

You can use your capacities according to the following process: 

  • Forecasts
    Your nominations forecast for each gas day can be send up to 6 months before the gas day in question. Monthly forecasts must be updated, at latest, by the 25th day of the current month (month M) for the following month (month M+1).
  • Nominations
    Every day, before 2 p.m. on day before (day D-1), you send your nominations for the following gas day (day D).
  • Scheduling
    Based on this information, GRTgaz carries out several operations (in particular checking your operational capacities and matching with adjacent operators) and sets your program accordingly.
    This program can be modified up to 3 a.m. on the gas day in question by sending GRTgaz your new nominations.

    >> Find out more about nominations and scheduling

    You can also visit the CORe (items E.1.1, E.1.2 and E.1.3) for more detailed information about forecasts, nominations and scheduling.   
  • Quantity allocations 
    The day after the gas day in question before 1p.m. (day D+1), the quantities allocated are communicated to shippers at the different network points. 

    >> Find out more about allocations 

GRTgaz provides round-the-clock operational support for managing the transmission of your gas on the network.

>> Find out more about the operational service outside of business hours

Each shipper is subject to a balancing obligation on a daily basis for the whole for the balancing zone, namely that of Trading Region France (TRF). Every gas day, shippers must take off as much gas as they deliver.  

Imbalance settlements are set based on GRTgaz interventions on the exchange. GRTgaz offers shippers the Alizés service, which allows them to avoid paying the imbalance penalty on days when GRTgaz does not intervene.   

>> Balancing and the Alizés service - August 1, 2020 
>> GRTgaz interventions on the Powernext Gas Spot exchange 

Comptes de résultat Equilibrage :

Trading Region France (TRF) is the result of a combination of optimised investments in the network, and complementary mechanisms for managing residual limits Congestions on the network and the activation of mechanisms to resolve them can be seen on Smart GRTgaz. 

>> Vigilance and activation of mechanisms
>> List of limits and superpoints 
>> TRF operational indicators 

The main mechanism used to resolve congestions is the locational spread - a call for tenders during the gas day via the exchange, which is open to all shippers. The selected shippers must modify their flows in exchange for compensation. 

>> The locational spread 
>> Locational spread - 01/01/2020 - 31/12/2020

The mechanism of last resort is mutualised restriction, which involves a partial cutting of firm capacities for a group of points known as “superpoints”. This gives you greater flexibility. Superpoints are also used in the case of works. As this restriction takes place during the gas day, you should review your guaranteed Allocated Operational Capacity (COA) to understand your rights.

Finally, situations in which the above mechanisms would be ineffective may in theory occur, in particular for storage facilities that are sparsely filled in winter. To protect against these instances, a Flow Commitment service allows GRT to keep stocks at a sufficient level. 

>> Flow Commitment Service 
>> Flow commitment – contractual framework 

GRTgaz maintains and inspects its facilities on a regular basis out of concern for safety and environmental protection. GRTgaz is committed to carrying out these works to the highest possible standard. Nevertheless, these can sometimes have consequences for the operational availability of the entry/exit capacities.   

To minimise the impact of restrictions, GRTgaz has implemented superpoints. These mutualise restrictions on a group of points, allowing greater flexibility in the use of your points. Superpoints are also used in the case of bottlenecks for mutualised restriction.  

>> Superpoints [nouveau]

Works program

  • Reference works programs 
    The reference works program published in March of Year N constitutes a commitment by GRTgaz towards its customers. This program can still be amended, with a notification period of 2 months prior to the start of the works. The level of restriction changes up to 5 days (D-5) before the start of the works in question. 
    Each shipper can access their restrictions on a daily basis via their TRANS@ctions portal. The works program  can also be viewed on Smart GRTgaz. This information is updated daily. 

    >> Works and the impact on operational capacity

Gas operators (transmission, storage, LNG terminals) publish their maintenance operations as part of a joint works program . See GRTgaz’s provisional program and the program  of other operators on the ODRé platform.

GRTgaz offers you several Help Files to help use the works program: 

For storage auctions: 2 Excel files produced jointly with Storengy provide a simple visual image of the impact of GRTgaz and Storengy restrictions on storage filling (« Storage filling »).

We organised a webinar on March, 4, 2021 about the the 2021 maintenance program:

>> Consult the presentation
>> See the replay

Provisional works program  for the following year

Before the official March publication of the works programme for a given year, GRTgaz publishes a general outline of the programme in October and then again in December of the preceding year. This publication is sent out by e-mail and is for illustrative purposes only. It allows you to plan ahead and prepare your programmes for the following year.

Program  can be downloaded for information purposes below:

Reminders: 
Only the restrictions published on Trans@ctions (CMNTt, CPRTt) are contractually valid.