Article 6c 1.

A Member State without underground gas storage facilities shall ensure that market participants within that Member State have in place arrangements with underground storage system operators or other market participants in Member States with underground gas storage facilities. Those arrangements shall provide for the use, by 1 December, of storage volumes corresponding to at least 15 % of the average annual gas consumption over the preceding five years of the Member State without underground gas storage facilities. However, where cross-border transmission capacity or other technical limitations prevent a Member State without underground gas storage facilities from fully using 15 % of those storage volumes, that Member State shall store only those volumes that are technically possible.