Cuba’s Ministry of Energy and Mines confirmed a “complete disconnection” of the national electrical system, marking the third major blackout in the past four months. Officials said there were no immediate failures reported in operating units at the time of the collapse and that investigations are underway to determine the exact cause, reported Associated Press.

By Monday evening, state media reported that electricity had been restored to only about 2 per cent of Havana’s residents—roughly 18,000 customers—along with limited supply to a few hospitals. Authorities said priority would next be given to restoring power to communication networks, while cautioning that the fragile system could fail again.