SEN
Cuba's national electrical grid; fragmented on 14 May 2026 into central and eastern microsystems.
Last refreshed: 18 May 2026 · Appears in 1 active topic
Has Cuba's national grid stopped being national?
Timeline for SEN
- What is the SEN in Cuba?
- The Sistema Eléctrico Nacional is Cuba's unified national electrical grid, operated by Unión Eléctrica Nacional. It fragmented on 14 May 2026 with the eastern provinces running on isolated microsystems.Source: Unión Eléctrica Nacional
- Why did Cuba's grid split on 14 May 2026?
- A 04:58 boiler-leak failure at the Antonio Guiteras thermoelectric plant triggered a partial disconnection from Ciego de Ávila through Guantánamo at 06:09, the SEN's ninth Guiteras-driven outage of 2026.Source: Unión Eléctrica Nacional
- How bad is Cuba's electricity shortage in 2026?
- UNE forecast a 2,050 MW peak deficit on 14 May, with Havana on 20-22 hour blackouts. Bloomberg satellite analysis shows nighttime light down by up to 50 per cent island-wide.Source: Bloomberg
- Which Cuban provinces lost power on 14 May 2026?
- Granma, Santiago de Cuba and Guantánamo operated on isolated local microsystems for vital services only; Ciego de Ávila, Camagüey, Las Tunas and Holguín reconnected sequentially by 10:44.Source: Unión Eléctrica Nacional
Background
The Sistema Eléctrico Nacional (SEN) is Cuba's unified National Grid, operated by the state utility Unión Eléctrica Nacional (UNE). At 06:09 on 14 May 2026, the SEN partially disconnected from Ciego de Ávila through Guantánamo, the first publicly documented case in 2026 of UNE choosing controlled fragmentation as an operational state. UNE sequentially reconnected the four central provinces over four hours: Ciego de Ávila at 08:16, Camagüey at 09:19, Las Tunas at 09:50 and Holguín at 10:44.
Granma, Santiago de Cuba and Guantánamo continued operating on isolated local microsystems for vital services only, meaning hospitals, water pumps and refrigeration relied on diesel generators the country cannot reliably refuel. UNE's 15 April bulletin earlier in the month had forecast a 1,732 MW shortfall against 3,000 MW demand. By 14 May the deficit forecast reached 2,050 MW, with Havana running 20-22 hour daily blackouts.
The proximate trigger for the fragmentation was the 04:58 boiler-leak failure of the Antonio Guiteras thermoelectric plant, its ninth outage of 2026. Bloomberg satellite analysis using NASA Black Marble and Sentinel-2 imagery confirmed Cuban nighttime light fell by up to 50 per cent island-wide, with Santiago de Cuba and Holguín worst affected. The unitary-grid claim that has organised Cuban state legitimacy since 1959 is no longer reliably true on any given morning.