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TAR NC Implementation Document – Second Edition September 2017 |

201

Entry points are in rows, exit points are in columns.

\\

Distance between two points may theoretically vary depending on the flow

scenario

in case 2 points are connected via at least one unidirectional pipeline

 1)

.

For example, in the current configuration the shortest path for gas between

storage point ‘A’ and bidirectional IP ‘K’ is simply along bidirectional pipeline

AK, and distance between A and K is therefore 10km. However, in a modified

configuration where pipeline AK would only allow flows from A to K (not any-

more between K and A), it would be still possible to flow gas at entry point K to

inject gas in storage A but along the pipeline via consumption point O. Further

to feedback received from stakeholders, ENTSOG would like to underline that

the shortest distance to flow gas between K and A would be the sum of distanc-

es KO and OA, and that this distance would be necessarily the one to use for

CWD distance calculation as per Article 8(1)(c), even if alternative longer routes

also exist to allow a flow scenario between K and A (e. g. KO, then OT, then TA).

Distance for flow scenario AK would still be 10 km, but distance for flow scenar-

io KA would be the sum of distances for KO and OA, that is 15.3km, compared

to 10km in the bidirectional case.

\\

If an entry point and an exit point are not connected according to a flow

scenario

, the distance between them in both directions is indicated by a ‘

0

written in red in the previous table. For example, storage point A and storage

point C are not connected according to a flow scenario: it is impossible to flow

gas within the network of the TSO from A to C or from C to A because of

unidirectional pipelines (section H to C is the problem in the ‘A to C’ direction,

section C to E is the problem in the ‘C to A’ direction).

\\

Flows from/to the same point are not considered as valid flow scenarios, and

are also marked with a ‘

0

’ in red (e. g. impossible to flow gas from A to A).

\\

Points S and T do not appear in the table since they are not relevant in tariff

derivation for the CWD counterfactual (neither entry, nor exit points).

 1) Note that in Article 8 of TAR NC, the calculation of the average distance for an entry point AD

En

and the calculation for

an exit point ADE

X

both refer to the same distance D

En,Ex

. For flow scenario reasons, Article 8 should actually make a

distinction between D

A,B

and D

B,A

.

Original case: distance for flow scenario is the same for AK

and KA

Variant: distance for flow scenario is now longer for KA

because pipeline AK is now unidirectional

Figure 63:

Impact of flow scenarios on calculated distances

N

A

√13

√80

√137

√32

10

O

J

K

M

23/3

G

S

T

N

A

√13

√80

√137

√32

10

O

J

K

M

23/3

G

S

T