Cuba reconnected its national electrical grid and restored power to the majority of the capital Havana by late on Sunday, energy officials said, nearly two days after an island-wide outage knocked out power to 10 million people.

Cuba blames the mounting crisis on a Cold War-era U.S. trade embargo and fresh restrictions from U.S. President Donald Trump, who recently tightened sanctions on the communist-run government and vowed to restore a "tough" policy toward the long-time U.S. foe.

Cuba restored power to most of Havana after a nationwide outage affected 10 million people. The grid collapse was triggered by a shorted transmission line. Oil-fired plants are back online, yet Cuba faces ongoing energy issues due to outdated infrastructure and geopolitical tensions.