ENTSOG GRIP CEE 2014-2023 / Main Report

n

E _ CB i + E _ UGS + E _ P

N 1 WINTER =

1

i = 2

X _ DOM

3.8.2 Summer

In addition to the data for entry capacities, the working gas volumes and maximum injection capacity to UGS of each country were also used for the calculation of re- gional N-1 and UGS injection in the summer period. The formula is set to determine how long the disruption can last without endangering the ability to cover demand and/or to fill the storage facilities. After a matching/correction of entry and exit capacities of each IP (lesser rule) the surplus of gas is allocated to neighbouring countries to meet their domestic demand. The N-1 value for summer is calculated for each country by setting the IPs of the main supply corridor to zero or to minimum volume that an upstream country (next or nearer to Ukraine/Belarus transport to relevant IP) is able to export. If the investigated country has a surplus of gas for sharing after satisfying its demand, the gas is then allocated to downstream countries, where necessary. These values are used for N-1 calculation as entries for each particular country.

ABBREVIATION

EXPLaNATION

E_CB i

All cross-border capacities in flow direction on supply corridor i without or with reduced biggest one (Ukraine/Belarus disruption) – mcm/d

E_P

Production entry capacity – mcm/d

E_UGS

UGS Entry Capacity (withdrawal) – mcm/d

X_DOM

Domestic seasonal peak daily demand (1 in 20) – mcm/d

E_OUT x

Remaining sources to fulfil the demand in neighbouring countries – mcm/d

∑ E_OUT x

Remaining sources to fulfil the demand in neighbouring countries and for injection to UGSs – mcm/d

Table 7: Explanation of the abbreviations in the Regional N-1 formula

GRIP Central Eastern Europe 2014–2023 |

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