Wind power is a very popular source of energy.

风力是一种非常受欢迎的能源。

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Wind power is a very clean source of energy.

风能是一种非常清洁的能源。

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In a recent speech in Iowa, he dismissed wind power as an unreliable energy source.

最近在爱荷华州的一次演讲中，他将风力发电视为一种不可靠的能源。

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They have a material that supplies electrons and a power source that lifts the energy level of those electrons.

VOA: special.2010.09.01

The car was built by the SUNY New Paltz Solarcar Racing Team in partnership with The Solar Energy Consortium as a way to promote environmentally conscious design and solar power as a viable energy source for personal transportation.

FORBES: In Which I Lose the Wheel of a $250,000 Solar Car

In China, wind energy has surpassed nuclear power to become the third largest energy source in the country.

ENGADGET: Inhabitat's Week in Green: P1 hybrid supercar, asteroid attack lasers and mosquito inoculators

Knies is hopeful that soon the world will embrace solar power as the leading source of energy.

CNN: Biography: Gerhard Knies