In the natural gas sector, CORES is responsible for ensuring compliance with the obligation to maintain minimum security stocks. Moreover, also within the scope of security of supply and as an activity that differentiates it from other similar European entities, CORES contributes to ensuring appropriate diversification of the natural gas supplies in Spain.
Maintenance of minimum security stocks
The obligation to maintain minimum security stocks of natural gas in Spain is calculated based on confirmed sales or consumption, establishing 10 days of strategic stocks, 10 days of minimum operating stocks of the system, and the days of minimum operating stocks of the user calculated annually according to article 4, Order TED/72/2023, as of 26th January, based on the filling trajectory indicated in article 6 of that Order. Before 10th February, CORES will notify each obligated entity the amount of its obligation to maintain minimum security stocks.
If the obligation to maintain minimum operating stocks of the user exceeds 7.5 days, the obligated entities may partially comply with it through liquefied natural gas (LNG) stored in Spanish regasification plants, maximum for the volume that exceeds the mentioned 7.5 days, including LNG assigned to fulfil the obligations of the Winter Action Plan. The rest must be maintained in underground storage.
CORES does not store strategic stocks of natural gas.
The entities obliged to maintain minimum stocks of natural gas are natural gas shippers and direct consumers on the market (for the part of their confirmed consumption not supplied by a shipper).
If needed, mobilization of the strategic minimum security stocks of natural gas corresponds exclusively to the Government. In the case of minimum operations stocks of the system, it corresponds to the person in charge of the Ministry for the Ecological Transition and the Demographic Challenge.
If over 50% of the total amount of the annual natural gas supplies used for domestic consumption (with the exception of gas acquired for facilities with alternative combustion) comes from a single country of origin, the shippers that provide over 7% of the annual supply must diversify their portfolios. CORES is responsible for overseeing this obligation.
The obligation to maintain minimum security stocks is established in 10 days of strategic stocks, 10 days of minimum operating stocks of the system and the days of minimum operating stocks of the user calculated annually