The value indicating the weight of the international interconnections of a country with respect to its installed power generation capacity is called the electricity interconnection ratio.
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In order to compare what percentage of a country’s electricity system is connected with its neighbouring countries, an electricity interconnection ratio is established, which is calculated by dividing the total import exchange capacity by the installed power generation capacity nationwide.
In 2002, the European Union recommended that all Member States should, by 2020, reach a minimum interconnection ratio of 10%, in order to eliminate systems that are basically ‘isolated’, provide mutual support and promote the Single Electricity Market.
Currently, Spain’s interconnection ratio, which is below 5%, is still far from the recommended target. If one considers that the real support to the Iberian Peninsula can come only from Central Europe through the border with France, the interconnection ratio of the Iberian Peninsula is 2.8%. Therefore, Spain basically can still be considered as an ‘electrical island’.