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Shuttering all of Dynegy-Vistra's coal-burning power plants in central and southern Illinois by 2025 wouldn't threaten grid stability, according to a report from the Natural Resources Defense Council and the Sierra Club, challenging a claim made by the utility. Instead, the duo argue, replacing those plants with wind and solar projects could save utility customers between $12 billion and $14 billion from 2018 to 2030.

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