Northeast Output Snaps Longest Winning Streak Since Dec.

Northeastern nuclear-power generation declined, snapping the longest string of gains since December, after Entergy Corp. cut output to the 651-megawatt Vermont Yankee 1 reactor.

U.S. production slid less than 0.1 percent to 78,029 megawatts, or 77 percent of capacity, a fourth consecutive daily decline, according to U.S. Nuclear Regulatory Commission data compiled by Bloomberg. Output was 2.1 percent higher than the year-earlier period as 21 of 104 plants were offline.

Entergy reduced output to 55 percent of capacity at Vermont Yankee 1, situated about 80 miles (129 kilometers) northwest of Boston, from 98 percent yesterday. Rob Williams, a plant spokesman based in Brattleboro, Vermont, did not immediately respond to a phone call or e-mail.

The cut led Northeastern generation lower by 1.1 percent to 23,375 megawatts, the first retreat in seven days, according to commission data compiled by Bloomberg. Generation dropped to 25,705 megawatts in the Southeast, while production advanced in the Midwest and Western regions.

Reactor maintenance shutdowns, usually undertaken in the U.S. spring or fall, when energy use is at its 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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