Spot electric power in the hub for Boston and Northeast Massachusetts doubled as consumption on the grid was higher than anticipated.

Use on ISO New England Inc.’s six-state grid touched 20,803 megawatts at 3:25 p.m., surpassing the forecast for the hour ending at 3:30 p.m. by 523 megawatts, or 2.6 percent, according to the system manager’s website.

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