Perhaps Uruguay is taking advantage of hydroelectric and geothermal power sources. Those are more reliable than wind (which is mercurial at best) and solar (which requires enormous real estate). If Uruguay is close to the Amazon River, then hydroelectric is a natural choice for energy there.
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I'm not sure about geothermal but you're right about hydroelectric. More than half of their energy production comes from that source.
Wind-based generation is pretty reliable there due to geographic aspects. They are one of the top producers of wind energy
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