Duke Energy has asked federal regulators to allow a temporary cooling-water system at the Allen power plant in Gaston County, allowing it to operate at full tilt through the late-summer drought.
Allen pulls millions of gallons a day from Lake Wylie and uses it to condense steam inside the coal-fueled plant. The warmed water is then piped into a canal where it cools before flowing into the South Fork of the Catawba River.
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Drought makes it harder to cool the discharged water, which must be below 102 degrees before flowing back into the lake. Little water flows into Wylie from tributaries and Duke releases less water from its dam, reducing the circulation of fresh water in the lake.
That problem could limit the amount of power Allen, one of Duke's largest plants at 1,140 megawatts, can produce. Demand for electricity is highest in summer, when air conditioners kick in around the region.
Duke's solution: Draw 86 million more gallons a day from the lake to the canal. The 11 percent increase of cooler water would further dilute the warm discharge water.
The utility applied Friday to the Federal Energy Regulatory Commission for permission to use the temporary system through September. Without it, said Joe Hall, Duke's lake-services director, Allen might have to curtail its operations.