Santa Clara, Cuba
A city in central Cuba's Villa Clara province, one endpoint of the 10 July transmission-line failure.
Santa Clara's transmission link to Sancti Spíritus gave way at 15:55 on 10 July 2026, the fault that triggered a frequency swing and took Cuba's entire national grid down within 35 minutes.
Last refreshed: 17 July 2026 · Appears in 1 active topic
One transmission line between two cities took Cuba's entire national grid down; how fragile is the network?
Timeline for Santa Clara, Cuba
One 220kV line took the island dark
Cuba DispatchBackground
Santa Clara is the capital of Villa Clara province in central Cuba, and a critical node on the island's national electricity transmission grid. Villa Clara's provincial capital sits at one end of the 220kV transmission corridor to Sancti Spíritus; that link gave way at 15:55 on 10 July 2026, setting off a frequency oscillation that dropped Cuba's National Electric System (SEN) entirely by 16:30, with 11 of 16 thermal generating units already offline island-wide before the line even failed and only 12.6 per cent of Havana back on supply afterwards.
The failure was the fourth of five total National Grid collapses recorded in 2026, and the second within an eight-day span that also included the 6 July Nuevitas failure and the 14 July Felton unit 1 trip. Santa Clara's role in the story is as a transmission chokepoint rather than a site of local generating failure: the fault lay in the line connecting it to Sancti Spíritus, not in any of the city's own power stations.
What caused Cuba's power grid to collapse on 10 July 2026?
Where is Santa Clara, Cuba?
