High-voltage line trip cuts Santiago de Cuba and Guantánamo from national grid

2026Published 26 Oct 2026Responsible editor: Chief Editor

SignificantElectricalProvisionalNext update 26 Oct

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What happened

A high-voltage transmission line tripped and separated the provinces of Santiago de Cuba and Guantánamo from the National Electric System, causing a significant disruption to electrical services across both regions. The Electric Union (UNE) reported the Cueto-Renté line trip on its WhatsApp channel and said restoration protocols were being activated. The Santiago de Cuba Electric Company separately told customers on its Telegram channel that a trip in a 220 kV line had caused the outage.

The reports do not clearly establish that these are the same line. The article notes that the timing is unclear, because the UNE message gives 13:14 while the message itself was posted at 12:32 p.m. The restoration time and the total duration of the outage were not reported.

Contributing factors

The cause of the line trip had not been specified by officials when the report was published.

Lessons learned

Operators should record the time of a trip from protection or SCADA data and keep it consistent across all public messages, so that restoration timelines can be verified.
Utilities isolating a region from the national grid should issue a single, consistent status update across all channels, including the cause, the affected areas and the restoration steps.
Restoration protocols for loss of a high-voltage line should be rehearsed in advance, so that regions can be reconnected quickly and safely after an islanding event.

More lessons on electrical protection and isolation, from every incident on the register.

Source

cubaheadlines.com

Published 2026-10-26. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.

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Chart to reuse with this story: Grid infrastructure incidents in Cuba, by year, free with a credit (PNG).

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