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Thermoelectric Plants in Mariel and Cienfuegos Rejoin National Power Grid

Sunday, September 14, 2025 by Sofia Valdez

Thermoelectric Plants in Mariel and Cienfuegos Rejoin National Power Grid
General view of the Mariel thermoelectric plant during startup work (Reference Image) - Image © Facebook/CTE Ernesto Guevara de la Serna

This Saturday, the state-run Electric Union (UNE) announced that Unit 8 of the Mariel thermoelectric plant and Unit 3 of the Carlos Manuel de Céspedes plant in Cienfuegos have been reconnected to the National Electric System (SEN). This move aims to mitigate the severe power outages impacting millions of Cubans.

The company also reported ongoing efforts to restart the Rente 6 unit and the Fuel engines at Mariel, which have resolved a technological issue and might be reintroduced to the grid promptly. This update comes amidst one of the most challenging weeks for the electric system, characterized by instability and multiple plant failures. Last Wednesday, the nation experienced its fifth blackout in less than a year when the Antonio Guiteras plant unexpectedly went offline, causing a complete shutdown of the SEN.

On Friday, the Céspedes plant was forced out of the system due to a condenser malfunction, resulting in widespread and prolonged power cuts across the country. Even the Electric Company and state media journalists acknowledged that operating the SEN was becoming increasingly difficult.

Understanding Cuba's Power Struggles

What is the significance of the Mariel and Cienfuegos plants reconnecting to the grid?

The reconnection of the Mariel and Cienfuegos plants to the grid is crucial in addressing the ongoing power outages in Cuba, providing some relief to the strained electric system.

Why did the Antonio Guiteras plant cause a nationwide blackout?

The Antonio Guiteras plant unexpectedly went offline, leading to a total collapse of the National Electric System, resulting in a nationwide blackout.

How are the ongoing power issues affecting daily life in Cuba?

The recurring power outages are severely disrupting daily life for millions of Cubans, affecting everything from household routines to economic activities.

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