Many of these companies say that they're not just using fuel cells to reduce energy consumption and pollution, provide reliable backup power, and attract good publicity.

许多这样的公司说，他们使用燃料电池不但是为了降低燃料消耗，降低污染，提供可靠的备用电力，取得良好的名声。

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There, they could store excess power from renewables and help smooth small fluctuations in power, making the grid more efficient and reducing the need for backup fossil-fuel plants.

这样，这些锂离子电池可以从可再生能源中存储多余的能源，有助于平抑电能供应的小波动，提高电网的效率，降低对备用火电厂的需求。

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The earthquake and tsunami knocked out outside power to the reactor complex and the tidal wave also disabled backup diesel generators, whose fuel tanks were swept away.

地震和海啸破坏了反应堆的外部电力供应，并且备用的柴油发电机也无法工作，因为海浪冲走了油箱。

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Telecom firms said they spent days preparing for Hurricane Sandy by activating regional coordination centers, testing equipment and positioning fuel for backup power generators.

WSJ: Telecom Firms Skirt Worst Damage

Second, nuclear reactors can only be run above maximum capacity for a short period before they begin experiencing complications, so each region maintains backup facilities to burn fuel oil or natural gas at peak periods or for when the nuclear reactors are offline.

FORBES: Japanese Oil Demand Likely To Jump

The power plant's backup diesel generators and their fuel supplies were destroyed by the tsunami.

WSJ: GE Steps Up Aid in Reactor Crisis