Eastern Power Jumps as Plants Shut for Maintenance

Spot power advanced in the mid-Atlantic grid as plants and transmission lines were taken out of service for seasonal maintenance.

About 32,600 megawatts of generation, representing 18 percent of PJM Interconnection LLC’s installed capacity, was projected to be offline, the grid manager said yesterday. Operators typically take advantage of a dip in demand during mild fall weather to service units.

“Constrained operations” were expected today and tomorrow in zones run by American Electric Power, Allegheny Power, Baltimore Gas & Electric, Delmarva Power & Light, Commonwealth Edison, PECO Energy, Dominion Virginia Power, and Public Service Electric & Gas, PJM said on its website.

The outages come as the high temperature in Washington today was forecast to be 81 degrees Fahrenheit (27 Celsius), 16 above normal, while Chicago’s high will be a normal 58 degrees, according to AccuWeather Inc. of State College, Pennsylvania. Analysts typically use 65 degrees as a benchmark for weather that requires no heating or cooling.

Spot wholesale power for PJM’s Eastern hub, which includes New Jersey, eastern Pennsylvania, Maryland and Virginia, gained $27.45, or 62 percent, to average $71.92 a megawatt-hour during the hour ended at 3 p.m. New York time from the same time yesterday, grid data compiled by Bloomberg showed.

Power in PJM’s Western hub, which includes deliveries to Washington, gained $16.40, or 36 percent, to average $61.78.

Power in the West traded $10.34 below the east, widening from a $6.67 discount yesterday, and compared with the three-month average discount of $1.54.

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