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Basic Storage Service
The Storage Access Contract is the same for all Customers, whatever the way the capacities were acquired (as storage rights, by auction, or on the secondary market). It specifies the conditions under which Storengy undertakes to:
- take off at a Point of Interface between Transmission and Storage the quantities of gas provided by the Customer and inject them into the Storage Facilities attached to this point;
- provide the equivalent quantities later at this same point, after withdrawing them from the corresponding storage facilities.
The operating rules are identical for all Customers in the same Storage group. They are intended to make the exercise of each Customer's rights compatible with the combined physical characteristics of the underground Storage Facilities within that Storage Group with a view to maintaining performance. Additionally, they allow each Customer to benefit from injection and withdrawal capacities that are not contingent upon other Customers' requirements in that Storage Group.
The storage access contract can be consulted and downloaded from the Documents and Tools page.
Under Basic Storage Service, in a given Storage Group, Customers reserve Nominal storage capacity stated in MWh which is the combination of:
- Capacity in volume (Mwh).
- Nominal withdrawal capacity (MWh/d), obtained by dividing the Nominal Storage Capacity by the Nominal Number of Days of Withdrawal Service.
- Nominal injection capacity (MWh/d), obtained by dividing the Nominal Storage Capacity by the Nominal Number of Days of Injection Service.
Daily injection and withdrawal capacity
A customer’s daily injection and/or withdrawal capacity for a given day depends on his own Inventory level: the higher the customer's inventory level, the greater his withdrawal capacity, and the lower his inventory level, the greater his injection capacity.
For a given day and storage group, daily capacity is equal to the product of the Nominal Capacity subscribed by the reduction factor corresponding to the inventory level on that day.
Minimum inventory and maximum inventory
In a given Storage Group, each Customer's Storage Inventory must range between Minimum inventory and Maximum inventory on any day. The customer's Storage Inventory can be, one day, below Minimum Inventory or above Maximum Inventory (except of values at 0% or 100% of storage inventory level) as long as the customers' Storage Inventory level be between Minimum Inventory and Maximum Inventory the day before and the day after.
In case an excess or a deficit Storage occurs on two consecutive days, this quantity is penalized by Storengy to the Customer at 50% of the Reference Price applicable that day in the Balancing Zone with which the Storage Group is associated.
The minimum and maximum Inventory levels are specific to each storage group and are given for each day of the year.
The minimum (or maximum) inventory to be applied to a customer on a given day is equal to the product of the nominal storage capacity subscribed to by the customer and the Minimum inventory level (or maximum) of that day.
Reversing the Direction of Gas Flow
When, on a given day, gas is injected into (or withdrawn from) storage on a Customer's behalf and the Customer requests gas to be withdrawn from (or injected into) storage on the next day, Storengy will endeavor to do so on a reasonable-efforts basis. Moreover, within the same day, customers may request the direction of gas flow to be reversed (see intra-day reversal of gas flow direction).
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Maintenance
Planned maintenance
The storage operator tries to minimise the impact of Storage Facility engineering work on its customers, and does not schedule any maintenance that might affect withdrawal during the Winter. Planned maintenance involves annual contractual quotas for injecting and withdrawing.
The schedule for planned maintenance is regularly updated and the storage operator agrees to give notice of maintenance as early as possible (at least two months ahead) if it is likely to reduce daily injection and/or withdrawal capacity. Maintenance notices cannot be changed by the storage operator after 6pm on the Thursday of week W for W+1.
To consult the list of planned Maintenance operations, click here.
Unplanned maintenance
Before 6pm at the latest on the day before, the storage operator, acting as a careful and cautious operator, may have to carry out exceptional emergency maintenance in a given group. In this case, customers receive indemnities.
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