The massive power outage that swept across Spain and the larger Iberian Peninsula in late April was caused by multiple technical and planning failures, according to a report released on Tuesday.

An estimated 80,000 fans are descending on Bilbao in what has been described as an 'English invasion', but locals were left gobsmacked at their inebriated state.

Spanish Prime Minister Pedro Sanchez and the country's grid operator Red Electrica de Espana (REE), however, have both said record levels of renewable energy were not at fault for the blackout.