At the onset of the earthquake, the plant automatically shut down the fission process, which normally would leave the coolant system — both the main one and a backup generator — still operational.

地震发生时，核电站已经自动中止裂变反应过程，一般只剩下冷却系统——主发电机和备用发电机——仍处于运行状态。

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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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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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