American power producers over the past two years have accumulated massive amounts of coal that are now sitting idle at their facilities — creating financial and storage headaches for utilities and coal miners alike, a new analysis has found.

The coal stockpile has reached about 138 million tons, or about the equivalent of the quantity of coal that Appalachia is expected to produce in 2025, according to the report, published on Monday by the Institute for Energy Economics and Financial Analysis.

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