Havana’s modern high-rises, symbols of mid-century ambition, have become vertical prisons. For the third consecutive night, rolling blackouts have left residents stranded in elevators, reliant on candles and battery-powered radios. The crisis, triggered by the collapse of Cuba’s aging Soviet-era power grid, has exposed a nation caught between economic embargo and climate vulnerability. Now, a consortium of British energy firms has stepped forward with an offer: a rapid deployment of solar microgrids and battery storage to power critical infrastructure. But can technology outpace a humanitarian and political standoff?
Cuba’s electrical system is a fossil of the Cold War. Eight of its 19 thermoelectric plants are offline; the remainder operate at 50 percent capacity due to a lack of maintenance and spare parts. The country’s fuel imports have plummeted by 40 percent since 2019 due to US sanctions and the pandemic. When the grid fails, it fails cascadingly. The blackout on Tuesday plunged 11 million people into darkness. In Vedado, a district of 20-storey apartment blocks, emergency services rescued 14 trapped residents from lifts. One man, José Luis García, described being stuck for four hours without ventilation. “It was like a coffin,” he said.
This is not merely an infrastructure failure. It is a public health emergency. Hospitals rely on backup diesel generators, but fuel stocks are critically low. Water pumps stop. Food spoils. The elderly and chronically ill are most at risk. The World Health Organization has warned of a rise in heat-related illnesses as temperatures hit 33°C with no fans or refrigeration.
Into this vacuum steps a consortium led by UK-based renewables firm Solara Energy. Their proposal: install rooftop solar panels and Tesla Powerwall batteries on 50 high-rise buildings within six months, creating independent microgrids for elevators, common lighting, and water pumps. “We’re not trying to solve Cuba’s entire energy crisis overnight,” Solara’s chief engineer Dr. Alistair Finch told me via satellite. “We are proving that distributed renewables can provide resilience for vulnerable points of failure. An elevator is a vertical transport artery. If we keep that running, we prevent the cascading panic.”
Finch’s calm urgency is a product of decades watching climate disasters unfold. He points to Puerto Rico after Hurricane Maria, where solar-battery microgrids kept supermarkets and medical clinics open while the main grid was down for months. “Cuba is perfectly suited for solar. High insolation, low cloud cover. The technology is mature. The holdup is political and financial.”
The political barriers are formidable. The US embargo prohibits transactions in dollars and restricts trade in goods containing more than 10 percent US-origin components, which includes many inverter and battery systems. British firms face secondary sanctions risk. However, UK export credit guarantees and a potential waiver for humanitarian technology could provide a legal pathway. The Cuban government, historically wary of foreign influence, has given conditional approval for a pilot project in three Havana boroughs.
Critics argue that microgrids are a bandage on a haemorrhage. “You could put solar on every roof in Havana and still not match the capacity of a single gas plant,” says Dr. Elena Ruiz, an energy economist at the University of Havana. “The solution is a mix: new fossil capacity to stabilise the base load, then renewables for peak shaving and resilience. But that requires capital that Cuba does not have.”
Britain’s offer is not a charity. Consortia members see a future market: Cuba’s energy transition has to happen, and those who help build it will win lucrative service contracts. There is also the matter of climate responsibility. The UK’s historical emissions far exceed Cuba’s. Financing adaptation in the Global South is not generosity; it is an overdue payment.
What happens next will be watched by other island states facing similar fragility. Haiti, the Dominican Republic, the Philippines – all have high-rise buildings with vulnerable elevator traps. If a British-Cuban partnership can light a path, it may illuminate more than corridors. It could demonstrate that resilience, when designed with precision, can override political inertia. The elevator is a metaphor: a small, enclosed system that, if kept running, allows the rest of the building to function. Focus on the node, and the network follows.
For now, Havana’s residents wait. The elevators remain dark. But on the rooftops, engineers are measuring solar angles. The data is clear: the sun is an inexhaustible resource, and the hour is late.
