Cuba’s Guiteras plant fails again, pushing power deficit near record

The Antonio Guiteras thermoelectric plant was knocked offline again by its boiler economizer, pushing Cuba’s projected power deficit to 2,206 megawatts, just two megawatts shy of the record. It was the same breakdown again at the country’s largest single generating unit, and the timing left the national grid with almost no margin.

The Matanzas plant, inaugurated in 1988 and rated at 250 megawatts, had already been disconnected from the National Electric System for the 17th time in 2026 when the latest failure hit. The recurring weak point is the economizer, the boiler component that has now accounted for half of all shutdowns at Guiteras this year. Between January and May, the unit logged 293 hours out of service because of economizer defects alone, a tally that shows the plant is not just aging but repeatedly losing the same piece of equipment.

That history matters because Guiteras is one of the few plants in Cuba that can move the national balance when it is running. When it goes down, the deficit rises fast, blackouts spread farther, and the grid has less reserve power to smooth over sudden demand. On June 29, even after Guiteras had briefly returned to service, forecasts still showed a nighttime shortfall above 2,000 megawatts. A few days earlier, on June 25 at 8:50 p.m., Cuba had already hit a deficit of 2,208 megawatts, the worst reported level of the year and the highest recent mark cited in these reports. More than 70 percent of the national territory was without electricity that night.

The strain has been visible outside the dispatch numbers. Communities in Matanzas were reported to have endured up to 85 consecutive hours without power around the late-June peak crisis, a stretch that turns every outage into spoiled food, stalled water pumping, dead fans, dark stairwells, and a harder day for hospitals, workplaces, and transport. Inside the plant, workers were already repairing three damaged economizer pipes as the country was pushed back toward another record deficit.

Guiteras has not had a major overhaul since 2010, leaving more than 15 years of accumulated technical debt on a unit that Cuba still leans on as a critical anchor. The broader solar push, including new photovoltaic parks, has not erased the nightly dependence on thermal generation. For now, every fresh economizer failure at Guiteras sends the same signal: the system’s biggest support beam is still buckling at the exact point it has failed before.