A cascade of power failures has paralysed Cuba’s urban centres, with residents of high-rise buildings bearing the brunt of an energy crisis that exposes the island’s decaying infrastructure. The blackouts, which began last Tuesday, have left thousands without electricity for up to 18 hours a day, elevating temperatures in concrete towers to unsafe levels and threatening the most vulnerable populations. In response, the United Kingdom has offered technical assistance to modernise Cuba’s grid, a move that underscores the geopolitical complexities of energy transitions amid a collapsing biosphere.
The immediate cause of the blackouts is a confluence of ageing thermal plants, fuel shortages and a spike in demand driven by a relentless heatwave. Cuba’s power generation capacity has dwindled to 3.4 gigawatts, far below the peak demand of 4.2 GW. The shortfall forces rolling blackouts that disproportionately affect residents in high-rises, where lifts stop working, water pumps fail and ventilation ceases. For those on the 20th floor, a blackout is not an inconvenience: it is a trap. Hospitals in Havana are running on backup generators, but fuel for those generators is running low.
This is a physical reality of a world that has ignored warnings for decades. The Caribbean is a front line of climate change, where rising sea levels and intensifying hurricanes are compounded by infrastructure designed for a stable climate that no longer exists. Cuba, despite its modest carbon footprint, is caught in a feedback loop: heatwaves increase demand, demand exceeds supply, blackouts force reliance on dirty generators, which further warm the planet.
The UK’s offer of energy expertise is framed as a gesture of solidarity, but its implications are sobering. British engineers will help Cuba assess its solar and wind potential, integrate battery storage and upgrade grid monitoring. These are necessary steps, but they are not quick fixes. Cuba’s energy transition requires investment, political will and time, resources the island lacks. The UK’s own track record is mixed: while it has reduced coal use, it still relies on gas and has struggled to insulate homes against heat and cold.
The blackouts in Cuba are a microcosm of a global phenomenon. From Puerto Rico to Lebanon, grid failures are becoming the new normal. The solution is not merely technical; it is systemic. We must accelerate the deployment of distributed renewable generation, microgrids and energy efficiency. High-rise buildings, for instance, can be retrofitted with rooftop solar and passive cooling, but this requires capital that Cuba does not have.
There is a calm urgency in the data. Global average temperature is 1.2°C above pre-industrial levels. Each fraction of a degree amplifies extremes. Cuba’s blackouts are a symptom of a biosphere under stress. The UK’s offer is a drop in the ocean, but it represents a recognition that we are all in this together, whether we like it or not. The question is whether we act before the next cascade hits.
