Cuban authorities have restored the national electrical grid after a large-scale power blackout knocked out electricity for millions of people this week.

The collapse of the grid highlights the fragility of Cuba's energy infrastructure and the ongoing diplomatic tension between Havana and Washington over trade restrictions.

The blackout occurred on Thursday, with the most severe impacts reported in major cities and the eastern provinces [1]. The national grid completely collapsed, forcing technicians to work through the outage to reconnect the system. Reports on the duration of the blackout vary, with the Energy Ministry stating the outage lasted 16 hours [2], while other reports indicate it lasted 29 hours [3].

Cuban officials said the United States' oil and energy blockade, along with related sanctions, caused the failure. According to the Energy Ministry, these policies have limited the island's ability to import necessary fuel, which in turn crippled power generation capabilities [4, 5].

Despite the restoration of the main grid, millions of people remained without power [6]. The instability of the system has created a humanitarian challenge, affecting hospitals, water pumping stations, and residential areas across the country.

In response to the crisis, the U.S. offered $100 million in aid to help Cuba stabilize its energy sector [7]. This offer comes as the island continues to struggle with aging equipment and a lack of foreign currency to purchase fuel on the open market.

Officials from the Energy Ministry said the restoration process was complex due to the scale of the collapse. They said the systemic failures are a direct result of external economic pressures, specifically the long-standing U.S. embargo.

Cuban officials blame US energy sanctions for the collapse of the electrical grid.

The recurring collapse of the Cuban power grid underscores a critical intersection of infrastructure decay and geopolitical conflict. While Havana attributes the failures to the U.S. blockade, the inability to maintain a stable grid suggests a systemic failure to modernize energy production. The U.S. offer of financial aid serves as a diplomatic tool, highlighting a willingness to provide humanitarian relief while maintaining the broader sanctions framework.