A blame game has erupted in Spain over the electricity blackouts that paralysed the region earlier this year, after the country's government blamed 'poor planning' on the national grid operator and 'improper' actions by electricity companies.

Following last night's release of a report on the devastating power cut, which affected the whole of the Iberian Peninsula, Spain's energy minister Sara Aagesen officially ruled out a cyberattack.

Instead, she said, grid operator REE misjudged power needs on April 28 when a surge in voltage caused the blackout.

She said: 'The system did not have sufficient dynamic voltage control capacity.'

The minister added that REE told the government 'that they made their calculations and estimated that [switching on more thermal plants] was not necessary at this time.