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TAR NC Implementation Document – Second Edition September 2017 |
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Cross-bookings from the discounted to the non-discounted account are prohibited.
As in case 1) neither a discount for the entry capacity nor for the exit capacity was
granted, no discount reduction applies. Actually the same price as for the IP was
paid and no discrimination of the competing IP is given.
In case 2), capacities have been injected and withdrawn at a discounted tariff.
Consequently the storage operator has to apply to its customers a discount reduction
to avoid a price discrimination towards the competing IP. Therefore, the discount
reduction corresponds to an ex post corrective charge to take account of the actual
use of the storage facility ‘as an IP’ by network users. The discount reduction is
calculated as follows:
(a)
The storage operator has to determine the maximum hourly capacity for each
day on which gas has between transferred between both entry-exit-systems
through the gas storage.
(b)
The maximum hourly transferred capacity is subject to a storage discount
reduction which consists of two components, one storage entry price component
and one storage exit price component. The storage entry price component is
the difference between the highest and lowest offered exit capacity tariff at the
respective storage of that TSO from which the gas was injected. The storage exit
price component is the difference between the highest and lowest offered entry
capacity tariff of the adjacent TSO.
(c)
Based on the determined storage entry and storage exit price components of
the discount reduction as well as the maximum hourly capacity (see a)), the
discount reduction is calculated. The discount reduction to be paid to the TSO
from which the gas was injected into the storage is calculated by multiplying the
storage entry price component with the maximum hourly transferred capacity
and a multiplier of 1.4. Further, the discount reduction to be paid to the TSO
into which the gas from the storage was withdrawn is calculated by multiplying
the storage exit price component with the maximum hourly transferred capacity
and a multiplier of 1.4.
Consequently, for the bypassing of an IP through a storage a multiplier of 1.4 is
applied for those gas volumes which were granted a discount before. The 40% on
top of the non-discounted tariff is used to restore tariff equality between tariffs at the
bypassed IP and tariffs at the storage used as an IP. The discount reduction is
collected by the storage operator for the benefit of both TSOs.
Figure 64:
Discount reduction for some storage facilities in Germany
E-E System II
E-E System I
Non-discounted capacity
Non-discounted capacity
Discounted capacity
Discounted capacity
Exit
Entry
Case 1
Entry
Case 2
Entry
Exit
Entry
Exit
Exit
Transfer fee applies
No transfer fee