Nationwide production fell 1.5 percent to 92,462 megawatts, or 91 percent of capacity, the biggest daily decline since Jan. 5, according to U.S. Nuclear Regulatory Commission data compiled by Bloomberg. Output was down 1 percent from a year ago with nine of 104 plants offline.
Entergy’s 1,297-megawatt Grand Gulf 1 reactor shut automatically because of a turbine trip, according to a report to the commission. The plant is about 25 miles (40 kilometers) southwest of Vicksburg.
Entergy slowed production to 84 percent of capacity at its 651-megawatt Vermont Yankee 1 reactor from full power yesterday.
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 43 days in 2011, according to the Nuclear Energy Institute.
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