ENTSOG Tariff NC - Implementation Document 2nd Edition

Storage facilities allowing for cross-system use in France In France, all storages are currently offered by GRTgaz, the TSO concerned by such specific storages, as firm and subject to climatic conditions. Furthermore, in the case of a storage facility connected to at least two entry-exit systems, increased dis- counts apply to such storage connection points compared to regular discounts. The reason is that such cross-system storages are specifically interrupted in order to maximise available capacities for flows from the PEG Nord to the TRS zone (with GRTgaz operating the PEG Nord zone and the Northern part of the TRS zone). This heightened risk of interruption justifies increased discounts at cross-system storag- es compared to regular storages. In practice, the storage discount is 85% on average for regular storages and about 90% for cross-system storages (due to reduced availability of TSO capacity). Two offers of virtual storage are identified at the cross-system storage, each referring to one specific entry-exit system. Any cross-system flow implies an adjustment in commercial accounts. Therefore, no distinction is made by way of an account for ‘regular’ storage use and an account for ‘cross-system’ storage use, it is only an adjustment between the accounts at each side of the system border. No transfer fee is charged on the basis of the technical entry and exit capacity at each side of the system border, the cross-system service is managed by the storage system operator only. Only one account per entry-exit system side is used. This configuration is only present at the interface between the PEG Nord and TRS zones. However, the merger of the PEG Nord and TRS zones in 2018 will probably make this cross-system configuration disappear. Therefore, this topic is only of tem- porary validity for the French market. Storage facilities allowing for cross-system use in Germany In Germany, the TSOs have to offer the same discount of 50% for entry and exit capacity even at those storage facilities – so that network users are allowed to register for a 50% discount – in case the storage operator is able to meet the following conditions: 1. The storage operator has to keep two gas accounts per customer, which is a significant difference with commercial practices in other MSs. (a) One account for the discounted gas volumes (50% discount), and (b) One account for the non-discounted gas volumes. 2. The storage operator is obliged to track on an hourly basis and for each direction (entry/exit) which volumes are booked on the account for discounted volumes and which are booked on the non-discounted account. The TSOs are to be provided with the information. Therefore, and in simplified terms, the choice of booking on either account by network users is an indication ex ante for the TSO on whether network users intend to use the storage facility ‘as a standard storage’ and/or ‘as an IP’. 3. The storage operator has to ensure that no cross-bookings from the discount- ed to the non-discounted accounts are done. In case the storage is used to transfer capacities from one entry-exit-system to another entry-exit-system and a discount was granted, a discount reduction for the transferred volumes applies. In case the storage operator’s customer is using storage facility to transfer capacity from one entry-exit-system to another entry-exit-system, two possible options are given. Capacity could be either transferred between: 1. The accounts for non-discounted capacities (case 1), or between 2. The accounts for discounted capacities (case 2).

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TAR NC Implementation Document – Second Edition September 2017