Most of today's residential electrical load on the grid occurs in the daytime hours.

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Monitoring equipment detected an abnormal electrical load and partially cut power to the Superdome "to isolate the issue, " Entergy said.

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Earth Hour does lessen the electrical load of power plants to some extent, thus making a small contribution for that hour by lessening the amount of coal burned.

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Shortly after the beginning of the second half of the Super Bowl in the Mercedes-Benz Superdome, a piece of equipment that is designed to monitor electrical load sensed an abnormality in the system.

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Electrical utilities need to ensure this daytime peak demand load does not exceed their supply capacity.

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