14 Other current and non-current liabilities

Other current liabilities, amounting to €30 million (€21 million at 31 December 2016), and other non-current liabilities, amounting to €388 million (€309 million at 31 December 2016), break down as follows:

Liabilities from regulated activities, amounting to €266 million (€179 million at 31 December 2016), relate to:

• the transportation segment (€228 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 €16 million and €212 million respectively;
• the storage segment (€38 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 (the same as at 31 December 2016).

Other liabilities of €152 million (€151 million at 31 December 2016) essentially include:

• pre-paid revenue and income (€19 million) relating mainly to the current and non-current portion of the pre-paid fee for the concession to use fibre-optic cables given to a telecommunications operator (€10 million and €9 million, respectively).
• other liabilities relating mainly to: (i) the higher quantities of fuel gas allocated by users of the transportation service 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 (€68 million); (ii) guarantee deposits paid as collateral by users of the balancing service, pursuant to Resolution ARG/gas 45/11 (€55 million euro).