Studies by the Electric Power Research Institute in Palo Alto, Calif., indicate that the cost of compressed-air energy storage today is about half that of lead-acid batteries.

加州Palo Alto电力科学研究院研究指出现今压缩空气能源储存的成本是铅酸蓄电池的一半左右。

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In the Philippines, the electric company Meralco wanted to educate people about how to conserve energy and lower the cost of their bills.

菲律宾的家用电器公司Meralco想告诉人们如何节省能源，降低开支。

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China's vast market and economies of scale are bringing down the cost of solar and wind energy, as well as other environmentally friendly technologies such as electric car batteries.

中国广阔的市场和经济规模正不断降低太阳能和风能，以及电动汽车电池等环保技术的成本。

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This is the story of how one man combined LEDs with solar energy technology to bring high-quality, low-cost electric light to poor people around the world.

VOA: standard.2009.12.13