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Sometimes, when the sun is out and his storage batteries are topped off, Mr. Lim's solar array will send surplus power back to the main grid.

有时候，太阳出来了，他的蓄电池充满后，廉先生的太阳能发电装置还可以将多余的电力送给主电网。

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Both long-distance and high-voltage transmissions require significant investment, but help transfer surplus power in China to areas where power is scarce.

远距离输电和高压输电都需要巨额的投入，但有助于将中国国内的剩余电量输送到那些电力短缺的地区。

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The question of possible surplus power, again, is not an issue.

CNN: The Bakun Issues

Carboy explained that in Europe, energy tariffs are "feed-in tariffs, " where customers who produce their own solar energy can sell back surplus power at premium rates.

FORBES: Magazine Article

The glut exacerbates the inefficiency by forcing the utilities to rely on dirtier and less efficient sources of power to meet peak demand rather than simply redirecting surplus power from low demand to high-demand markets.

FORBES: The Answer To The Energy Problem