And last year, it announced $325 million for 15 long-duration energy storage projects, including one that stores heat energy in concrete and others to make newfangled batteries made of iron, water. . Cuba's grid infrastructure is so weak that run-of-the-mill problems like transmission line failures and generator trips are causing widespread outages. The unexpected shutdown of the Antonio Guiteras oil-fired power plant started the total blackout in October 2024. Some of these energy sources are used directly while most are transformed into fuels or. . Yet Cuba's power outages increased by 23% in 2023 despite adding 450MW solar capacity. But here's the kicker – less than 15% have proper energy storage systems. This concise guide provides the first complete overview of renewable energy technologies in Cuba and their current capabilities and prospects.