A partial failure of Cuba’s National Electric System caused widespread power outages across five western provinces after two high-voltage transmission lines simultaneously failed. Crews work to restore electricity after a partial failure of Cuba’s National Electric System caused outages across five western provinces. Photo: EFEPower restoration began in Havana after a transmission failure split Cuba’s national electricity grid, affecting five western provinces. A partial failure of Cuba’s National Electric System (SEN) left five western provinces without electricity on Saturday after two high-voltage transmission lines simultaneously tripped, splitting the national grid and causing a widespread outage, authorities said. The outage affected the provinces of Pinar del Río, Artemisa, Mayabeque, Havana and Matanzas, temporarily disrupting electricity service for millions of residents across five of western Cuba’s six most populous provinces.