It also has a backup generator in place so its main New York trading floors can operate on Monday.

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With a backup generator, Mr. Zimmermann said he expects to work from home for the next two or three days.

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An emergency backup generator is only allowed to operate for 200 hours every year and only in the event of an emergency power failure or for routine testing and maintenance.

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Neither solar nor wind are powerful enough to carry the heavy load that a backup generator must provide to a facility such as a hospital or a school or a county prison.

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The NYSE switched over to its backup power generator Monday night when Consolidated Edison Inc.

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