The 65 kilometre link travels from Baixas, near Perpignan in southern France to Santa Llogaia in northern Spain. An eight kilometre tunnel carries the cables under the Pyrenees Mountains.
The system can carry 2GW of electricity in both directions with power reversal possible in 0.15 seconds.
Siemens was contracted by the Interconnexion Electrique France Espangne consortium to build the link's converter stations.
Interconnectors feature in the new European Commission's Energy Union plan. EC vice president for Energy Union, Maros Sefcovic, set a minimum interconnection target of 10% of installed electicity production capacity per member state by 2020. This should increase to 15% by 2030.
In October, Spanish wind association AEE claimed 533GWh, or 5% of total wind generation, worth over €42m, were curtailed first quarter 2013 alone, largely due to poor interconnection with France. This link more than doubled the amount of interconnection between the two countries.