U.S. nuclear-power generation dropped from an 11-week high after Exelon Corp. (EXC:US) slowed output at reactors in Illinois and Pennsylvania.
Nationwide production fell 0.8 percent to 84,275 megawatts, or 83 percent of capacity, from yesterday’s 84,982 megawatts, which was the most since March 9, to according to Nuclear Regulatory Commission data compiled by Bloomberg. Output was 1.9 percent higher than a year ago with 14 of 104 plants offline.
Exelon Corp. reduced output at the 1,118-megawatt LaSalle 1 reactor in Illinois to 80 percent of capacity from full power yesterday. The unit is about 70 miles (113 kilometers) southwest of Chicago.
Generation at Exelon’s 1,134-megawatt Limerick 1 plant, about 30 miles northwest of Philadelphia, was cut to 60 percent after operating at full capacity yesterday.
Duke Energy Corp. (DUK:US) lowered production at South Carolina’s Catawba 2, which can produce 1,129 megawatts of electricity, to 48 percent from 100 percent yesterday. The unit is about 17 miles southwest of Charlotte, North Carolina.
Constellation Energy Group Inc. increased output at the 862-megawatt Calvert Cliffs 2 reactor, about 38 miles south of Annapolis, Maryland, to 30 percent from 3 percent. The plant is ramping up after it tripped offline on May 21 because of equipment failure associated with the steam generator feed pump, according to the NRC.
Production at Dominion Resources Inc. (D:US)’s 973-megawatt North Anna 2 unit in Virginia was boosted to 68 percent from 48 percent. The reactor restarted earlier this week after completing work.
Reactor maintenance shutdowns, usually undertaken in the U.S. spring or fall when energy use is lowest, may increase consumption of natural gas and coal to generate electricity. The average refueling down time was 46 days in 2012, according to the Nuclear Energy Institute.
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