18. Other current and non-current liabilities

Other current liabilities, amounting to €71 million (€51 million at 31 December 2014), and other non-current liabilities, amounting to €293 million (€276 million at 31 December 2014), break down as follows:

Liabilities from regulated activities, amounting to €206 million (€180 million at 31 December 2014), relate to:

• the transportation segment (€167 million) due to the transportation revenue invoiced in excess of the restriction established by the regulator and penalties charged to users who exceeded the committed capacity; this amount is to be returned through tariff adjustments pursuant to Resolution 166/05 of the Authority. The current and non-current portions amount to €57 million and €110 million respectively (€16 million and €119 million at 31 December 2014);
• the storage segment (€39 million) due to payments for balancing and stock replenishment, to be returned to service users pursuant to Resolution 50/06 of the Authority. The amount corresponds entirely to the non-current portion (€26 million and €19 million respectively for the current and the non-current portions at 31 December 2014).

The market value of the derivatives outstanding at 31 December 2015 (€1 million; €10 million at 31 December 2014) is broken down in Note 11 “Other current and non-current assets”.

Other liabilities of €157 million (€137 million at 31 December 2014) include:

• prepaid revenue and income (€23 million) relating mainly to the current and non-current portion of the prepaid fee for the concession to use fibre-optic cables given to a telecommunications operator (€2 million and €12 million, respectively);
• other liabilities relating mainly to: (i) guarantee deposits paid as collateral by users of the balancing service, pursuant to Resolution ARG/gas 45/11 (€62 million euro); and (ii) the higher quantities of fuel gas allocated by users in previous years pursuant to Resolution ARG/gas 184/09 compared with the quantities actually used in those years, equalised by reducing the quantities allocated by users. The current and non-current portions amount to €9 million and €53 million respectively.