The fossil fuel industry likes to make out that it is a pipe dream to think that we can completely replace fossil fuels with alternative sustainable sources. But the example of Uruguay shows that it is not only possible but the transformation can be done in as short a time as five years.
By the early 2010s, Uruguay’s government realized that continuing to rely on imported fossil fuels was economically unsustainable. Méndez Galain, then a particle physicist with no formal experience in the energy sector, proposed a bold plan: to build a system that relied almost entirely on domestic renewable resources—wind, solar, and biomass—and do it in a way that was cheaper than fossil fuels.
The results speak for themselves. Today, Uruguay produces nearly 99% of its electricity from renewable sources, with only a small fraction—roughly 1%–3%—coming from flexible thermal plants, such as those powered by natural gas. They are used only when hydroelectric power cannot fully cover periods when wind and solar energy are low. The energy mix is diverse: while hydropower accounts for 45%, wind can contribute up to 35% of total electricity, and biomass—once considered a waste problem—now makes up 15%. Solar fills the gaps.
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