But using light to process information is tricky, requires exotic materials and lasers that demand more power than conventional transistors.

但是利用光来处理信息还很复杂，要求有合适的材料和需要有比传统晶体管能力更强的激光器。

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And if cars switch from oil to electricity, the demand for power generated from carbon-free sources will increase still further.

如果汽车由石油驱动改为电驱动的话，对于碳素燃料所产生的电能的需求将会增长许多。

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In some countries, including America, the grid has not kept up with the growth in demand for power.

包括美国在内的某些国家，电网无法满足用电需求的增长。

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Some mountainous regions benefit from hydropower. Less than four percent of the nation's electricity demand is met with renewable sources like solar and wind power.

VOA: standard.2010.03.23

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

While the Kingdom is the world's largest oil exporter, power demand is growing approximately 8% per year, prompting authorities to investigate alternative sources of power, that can ease the demand on its primary source of income.

FORBES: Magazine Article

But we need to reduce our reliance on them even as our demand for power increases.

FORBES: Hurricanes Drive Home Appeal Of Alternative Energy Sources