Spanish power company Red Eléctrica has ruled out a cyber-attack as the cause of Monday's mass blackouts, that left millions across Spain and Portugal without power.
Portuguese Prime Minister Luis Montenegro also said there was no indication that a cyber-attack was behind the outages.
Electric grids suffered two "disconnection events" - systems recovered from the first, but the second triggered the power cuts in both Spain and Portugal, with no indication of human error.
Power has now been fully restored in Spain and Portugal but travel disruption continues.

西班牙电力公司Red Eléctrica排除了网络攻击是周一大规模停电原因的可能性,停电导致西班牙和葡萄牙数百万居民断电。
葡萄牙总理路易斯·蒙特内哥罗也表示,没有迹象表明网络攻击是导致停电的原因。
电网经历了两次“断开事件”——系统从第一次故障中恢复过来,但第二次故障导致了西班牙和葡萄牙的停电,没有迹象表明是人为错误。
目前,西班牙和葡萄牙的电力已经完全恢复,但交通中断仍在持续。