Sancti Spíritus
A central Cuban city, the other endpoint of the transmission line whose failure collapsed the grid on 10 July.
Sancti Spíritus, capital of the central Cuban province of the same name, was one end of the 220kV transmission line whose failure on 10 July 2026 triggered a full collapse of Cuba's national grid within 35 minutes.
Last refreshed: 4 August 2026 · Appears in 1 active topic
One transmission line linking two Cuban provincial capitals took the whole island dark; why so fragile?
Timeline for Sancti Spíritus
Mentioned in: UNE blames a 110kV fault, not a storm
Cuba DispatchOne 220kV line took the island dark
Cuba DispatchBackground
Sancti Spíritus is the capital of the province of the same name in central Cuba. Its role in Lowdown's coverage to date has been as one endpoint of critical national infrastructure rather than as the site of local generation failure: the 220kV link tying the city to Santa Clara tripped at 15:55 on 10 July 2026, and the frequency oscillation that followed brought down the entire National Electric System by 16:30.
The province also featured separately on religious-freedom grounds in the same window: a pastor was detained after a religious procession in Cabaiguán, within Sancti Spíritus province, on 28 June 2026, a distinct story from the grid failure with no evidenced connection between the two events.
Its transmission line failure blacked out Cuba
A 220kV transmission line between Santa Clara and Sancti Spíritus failed at 15:55 on 10 July 2026. The resulting frequency swing knocked out the whole National Grid by 16:30, with only 935 MW available against 3,100 MW of demand, the fourth of five total SEN collapses recorded that year.
Eleven of Cuba's 16 thermal units were already offline before the fault, leaving no spare capacity to absorb a single line failure. Afterwards, just 12.6 per cent of Havana had power back, illustrating how a fault at either end of one transmission link, not local generation, was enough to collapse the whole system.
Where is Sancti Spíritus, Cuba?
Why did the Santa Clara to Sancti Spíritus power line fail?
