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Find out more about Optiflow service - December 2017 1
Find out more about…
The Optiflow service allows more flexibility
during maintenance periods when there
are works on the core of GRTgaz
transmission network.
Thanks to this new service, restrictions are
now mutualised on different points point
groups (ou groups of points), called
superpoints. Thus, you can optimise your
nominations and maximise your favorite
point.
Who is concerned?
You are concerned if you use one of the North entry points, among the PITTM Dunkirk LNG
and the PIR Dunkirk, Virtualys, Obergailbach and Oltingue (backhaul).
Optiflow : more flexibility and more capacity
More flexibility
Let’s take the example of works that reduce by 2 the
capacity on a group of 2 points: 500 instead of 1,000
(in GWh/d). Formerly, GRTgaz divided up this
constraint by point (250 and 250). Thanks to
Optiflow, shippers have the choice: you can for
instance choose to maximise the point A (500 + 0).
Without superpoint With superpoint
res
tric
tio
ns
Max A = 250; Max B=250 Max (A+B)=500
GRTgaz decides for the shippers Shippers have the choice
Example: Nom A= 450 / Nom B = 50
+
The Optiflow service
+
Superpoint
Firm capacity
subscribed = 500 Firm capacity
subscribed = 500
Residual capacity during
works period = 500
Find out more about Optiflow service - December 2017 2
More capacity
Your exit confirmation within a superpoint allow you to nominate more in entry within the same
superpoint.
Example: superpoint « A+B-C », C is an exit. We suppose there is the same constraint than in
the previous example: max (A+B-C) = 500.
The quantities you have scheduled on C (e.g. 100) offer you a proportionate increase of the
flexibility you have to nominate in entry (500+100=600 sur A+B).
Summers 2017 & 2018: 4 superpoints during works
For both 2017 & 2018 summers, superpoints during works are:
● SP1 : DKGNL + DK
● SP2 : DKGNL+ DK + Virtualys
● SP3 : Virtualys + Obergailbach
● SP4 : Virtualys + Obergailbach –
Oltingue
How could you visualise your restrictions on a point?
To visualise your restrictions on a point, you must consider the restrictions on this point (PCR)
as well as on all superpoints that include this point. This applies to the maintenance works
program and to the visualisation of your operational capacities.
Then, they will change when the
single market place will be put in
operation on November 1st, 2018.
Find out more about Optiflow service - December 2017 3
Example for a day when SP3 is active with an individual capacity restriction on Obergailbach:
The checking of the maintenance works program
For instance, if you want to visualise restrictions on PIR Dunkirk in entry, you must take into
account:
- Restrictions only on PIR Dunkirk in entry: TRF 22.48 % and TRI 100 %
- Restrictions on SP1 (Dunkirk +DKLNG): TRF 1.66 %
- Restrictions on SP2 (Dunkirk +DKLNG - ALV +TH): there are no restrictions on SP2 for
the day we consider in this example
If you want to see capacity restrictions on PIR Obergailbach (entry), TRANS@ctions
automatically shows the restrictions of all the superpoints that are including Obergailbach (SP3
& SP4), as well as individual restriction of Obergailbach point. So, in the example above:
- Restrictions on SP3 (Virtualys + Obergailbach): TRF 43.16%
- Restrictions on PIR Obergailbach only (entry): TRF 67.27%
- Restrictions on SP3 (Virtualys + Obergailbach - Oltingue) : there are none in the
example
- The last line is about the restriction on Obergailbach point (SP4) and has the same
information as the previous line (SP3)
Checking of your operational capacities
Your operational capacities are displayed by superpoint, and then by point the superpoint
includes.
For instance, if you want to know your restrictions on PIR Obergailbach, you must take into
account:
- COE of the PIR Obergailbach (in the table, you can see the COE several times, below
each superpoint that includes this point)
- COE of SP3 (Virtualys + Obergailbach)
- COE of SP4 (Virtualys + Obergailbach - Oltingue): it is not restrictive
VIRTUALYS
VIRTUALYS
Find out more about Optiflow service - December 2017 4
A client who subscribes only on Obergailbach point (and who doesn’t subscribe on Virtualys)
has to take the minimum between the COE of Obergailbach and the COE of SP3 to know the
reduced capacity on Obergailbach for this day.
How could you visualise the UBI available?
A superpoint is active when its CTE is strictly less than the sum of the technical capacities of
entry points this superpoint includes.
When a superpoint is active, the sales of daily and infra-daily capacities on the entry points
this superpoint includes is are stopped. Then, the UBI service is opened on these entry points,
with the superpoint scale. For instance, if SP3 is active, a non-used capacity in Obergailbach
could be used for Virtualys (up to the limit of the possible capacity reduction on Virtualys).
To visualise the UBI available on a point:
- If this is an entry point including into an active superpoint: the UBI is opened on this
point, the available UBI is displayed for the concerned superpoint and not for the
particular point (e.g. here for Virtualys and Obergailbach, there are 245 GWh/d of UBI
on Virtualys + Ober - Oltingue). The UBI is also calculated by point but is not displayed
(for example here, as the point Obergailbach is restricted, there might be little UBI
available on Obergailbach alone ; then, there will be more UBI left for Virtualys)
- If this is not an entry point including into an active superpoint or if it is an exit point: if
the UBI is opened for this point, it is displayed for the particular point (e.g. here it is
Oltingue, North-South or Taisnières B).
VIRTUALYS
VIRTUALYS
Find out more about Optiflow service - December 2017 5
How could you maximise your nominations?
You keep nominating by point (and not by superpoint), even if restriction are visible by
superpoint. GRTgaz makes a tool to help you nominate available on TRANS@ctions. Thanks
to this tool, you can estimate the guaranteed quantities by point, depending on:
- your nominations on the other points
- the quantities you have already scheduled (also called “already flowed quantities”) (pro-
rata temporis).
VIRTUALYS
VIRTUALYS
Find out more about Optiflow service - December 2017 6
To assess if your nomination could be accepted, you only have to write it in the column “net
quantity”:
- If the box becomes red, it means you have nominated less than the already flowed
quantity: the nomination may not be accepted
- If the box remains colourless, your nomination respects your firm rights on each point
and superpoint, and it takes into account the pro-rata temporis (already flowed quantity)
and nominations on other points of the table. You can see your right in the “maximum
guaranteed quantity” column
- If the box becomes orange, your nomination goes over your firm rights: it could be
accepted depending on the UBI that is available
The “remaining guaranteed quantity” column shows you the additional guaranteed quantity
you can nominate on each point. It corresponds to the difference between the maximum
guaranteed quantity and your nomination on the considered point.
How the confirmation is calculated?
If you nominate more than your guaranteed quantities, GRTgaz calculates confirmation thanks
to the 3 usual steps:
1) control of your subscription
2) calculation of the UBI that respects the rights
3) calculation of the UBI out of the rights
At each step, GRTgaz reduces your nominations if it is necessary to respect the constraints
by point and by superpoint (video tutorial “How are my nominations curtailed?”)
Your confirmation, as well as your allocation, are still published by PCR.
Find out more about Optiflow service - December 2017 7
Simplified schematic of the 3 steps
0. Nomination
1. Subscription control
2. Calculation of the UBI into the rights
3. Calculation of the UBI out of the rights
Matching with the adjacent TSO, and then confirmation
We take into account curtailed nominations at the COE, at the PCR scale and then at the superpoint scale
Allocation at the pro-rata of the demand of UBI into the rights, at the PCR scale and then at the superpoint scale
If it remains UBI: allocation at the pro-rata of the demand of UBI out of the rights, at the PCR scale and then at the superpoint scale
If nominations
exceed the COE
PCR or the
superpoints
If there are both
available UBI and
UBI demand
If it remains
available UBI and
non allocated
demand of UBI
GRTgaz: calculation
of the confirmation
Find out more about Optiflow service - December 2017 8
Example of a confirmation calculation: active superpoint
In the following example, to make it easier to understand we consider only 1 step for the UBI
(we don’t make any difference between UBI into rights and out of the rights). Here is an
example of the calculation of a confirmation for a client who has subscribed 100 on TH and
100 on Obergailbach, with a restriction rate of 50% on Virtualys + Obergailbach.
Exemple pour un shipper Données tous shippers
TH Ober TH Ober
CTN 640 620
COS 100 100 ∑COS 500 500
TRF 0% 0%
TRF
COE 100 100 CTE 640 620
COE CTE
Nomination 120 80 ∑Nominations 400 350
1. Contrôle de souscriptions TH Ober TH Ober
niv 0 100 80 hypothèse:
niv 1 56 44 prog' hors UBI 280 175
UBI dispo 360 445
UBI dispo
2. Optimisation UBI TH Ober TH Ober
demande UBI 64 36 demande UBI 120 175
niv 0 64 36 niv 0 120 175
niv 1 10 5 niv 1 (UBI alloué) 18 27
Programmation finale 65 50 298 202
50%
100 500
45
on écrête à la COE
si somme du niv 0 > COE sp: on écrête au pro-rata du niveau 0
Par point: si demande UBI < offre UBI, allocation au pro-rata
Pour le superpoint: si niv 0 < offre UBI niv 0, allocation au pro-rata
Nom' - prog' hors UBI
Example for a shipper Data all shippers
1. Subscription control
hypothesis
Confirmation except UBI
Available UBI Available UBI
UBI demand
(allocated UBI)
Nom’ – confirmation except UBI
By point: if UBI demand < UBI offer, allocation at the prorata
For superpoint: if niv 0 < UBI niv 0 offer: allocation at the prorata
Final confirmation
2. UBI optimisation
We curtail at the COE
If sum of niv 0 > COE sp:
We curtail at the prorata of niv 0
UBI demand
Virtualys Virtualys
Virtualys Virtualys
Find out more about Optiflow service - December 2017 9
Example of a confirmation calculation: active superpoint + reduction on a
particular point
In the following example, to make it easier to understand we also consider only 1 step for the
UBI. Here is an example of the calculation of a confirmation for a client who has subscribed
100 on Obergailbach, with a restriction rate of 50% on Virtualys + Obergailbach and 60% on
Obergailbach.
Even if UBI is available on Virtualys + Obergailbach, the UBI demand of the client can’t be
achieved because the UBI offer is equal to zero on Obergailbach. However, clients on TH
receive the superpoint entire offer of UBI.
Exemple pour un shipper Données tous shippers
TH Ober TH Ober
CTN 640 620
COS 100 ∑COS 500 500
TRF 0% 60%
TRF
COE 0 40 CTE 640 200
COE CTE
Nomination 0 120 ∑Nominations 400 400
1. Contrôle de souscriptions TH Ober TH Ober
niv 0 0 40 hypothèse:
niv 1 0 40 prog' hors UBI 280 200
UBI dispo 360 0
UBI dispo
2. Optimisation UBI TH Ober TH Ober
demande UBI 0 80 demande UBI 120 200
niv 0 0 0 niv 0 120 0
niv 1 0 0 niv 1 (UBI alloué) 20 0
Programmation finale 0 40 300 200
50%
50 500
20
on écrête à la COE
si somme du niv 0 > COE sp: on écrête au pro-rata du niveau 0
Par point: si demande UBI < offre UBI, allocation au pro-rata
Pour le superpoint: si niv 0 < offre UBI niv 0, allocation au pro-rata
Nom' - prog' hors UBI
Virtualys Virtualys
Virtualys Virtualys
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