A cascading failure of Cuba’s aging power grid has left millions without electricity for a third consecutive day, with the blackout particularly severe in Havana where residents of high-rise buildings remain trapped in their apartments. The crisis, which began on Friday when the Antonio Guiteras power plant unexpectedly went offline, has exposed the fragility of an energy infrastructure already strained by decades of underinvestment and US sanctions.
Satellite data from the National Oceanic and Atmospheric Administration shows the island plunged into darkness from west to east, with no major thermal generation online. Cuba’s grid, a relic of Soviet-era engineering, operates on a centralised model that is inherently vulnerable to single-point failures. The loss of the Guiteras plant, which supplied roughly a quarter of the nation’s power, triggered a chain reaction of overloads and automatic shutdowns. By Saturday, 14 of the country’s 15 main power plants were offline.
The human cost is mounting. In central Havana, residents of 20-storey apartment blocks have been unable to leave due to non-functional lifts and emergency lighting. There are reports of heat-related illnesses and water shortages, as pumps fail and supplies run low. The Cuban government has deployed generators to hospitals and water treatment facilities, but the scale of the blackout has overwhelmed local capacity.
This is not merely a breakdown of machinery. It is a collapse of a system that was already operating at the edge of its physical limits. Cuba’s per capita energy consumption is among the lowest in the Caribbean, yet its generation fleet has an average age of over 30 years and a capacity factor below 50%. The country imports nearly all its fuel, mostly from Venezuela, which has itself seen production declines. The result is a chronic deficit: the national grid has been subjected to rolling blackouts for months, with daily cuts lasting up to 12 hours in some provinces.
Against this backdrop, calls are growing in London for British energy firms to offer technical assistance and expertise. The UK has a long history of collaboration with Cuba on renewable energy projects, and British companies have developed advanced grids for island nations in the Caribbean. A spokesperson for the Foreign Office said the government is “monitoring the situation closely” and is “open to discussions with energy firms that can provide support”. But such interventions require regulatory clarity and financing, neither of which is in abundant supply.
There is a cruel irony in this crisis. Cuba has some of the best solar and wind resources in the world, with insolation levels exceeding 5.5 kWh per square metre per day and trade winds that could drive turbines at 80% capacity factor. Yet the transition to renewables has been painfully slow, hindered by the same sanctions that restrict access to modern equipment and spare parts. The current blackout should serve as a stark reminder that resilience is not an optional extra in energy planning, it is a prerequisite.
For those of us who watch the Earth’s systems for a living, the Cuban blackout is a microcosm of a larger, global fragility. Every grid is only as strong as its weakest transformer. And every nation that relies on a handful of ageing plants is one mechanical failure away from catastrophe. The question is not whether such failures will happen again, it is where and when.
British energy firms have an opportunity here to demonstrate that their expertise is more than a commercial commodity, it is a tool for resilience. They can help Cuba bypass the centralised fossil fuel model and leapfrog to a distributed, renewable grid. But the clock is ticking. Every hour without power is a danger to the trapped residents of Havana’s high-rises. And every degree of warming makes such crises more likely.
