SAN LUIS, Ecuador—Built near a spewing volcano, it was the biggest infrastructure project ever in this country, a concrete colossus bankrolled by Chinese cash and so important to Beijing that China’s leader, Xi Jinping, spoke at the 2016 inauguration.Today, thousands of cracks have emerged in the $2.7 billion Coca Codo Sinclair hydroelectric plant, government engineers said, raising concerns that Ecuador’s biggest source of power could break down.
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