The revolt here on the banks of the Madeira River, the Amazon’s largest tributary, flared after sunset. At the simmering end of a 26-day strike by 17,000 workers last month, a faction of laborers who were furious over wages and living conditions began setting fire to the construction site at the Jirau Dam.

Men in camouflage fatigues still patrol the sprawling work site, reflecting a dilemma for Brazil’s leaders. Even as they move to tap one of the world’s last great reserves of hydroelectric power, the Amazon basin, strikes and worker uprisings at the biggest projects are producing delays and cost overruns.

Story length: 1,275 words

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