NEW YORK – Electricity prices are probably on their way up across much of the U.S. as coal-fired plants, the dominant source of cheap power, shut down in response to environmental regulations and economic forces.

New and tighter pollution rules and tough competition from cleaner sources such as natural gas, wind and solar will lead to the closings of dozens of coal-burning plants across 20 states over the next three years. And many of those that stay open will need expensive retrofits.

Because of these and other factors, the Energy Department predicts retail power prices will rise 4 percent on average this year, the biggest increase since 2008. By 2020, prices are expected to climb an additional 13 percent, a forecast that does not include the costs of coming environmental rules.

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