目前最便宜的太阳能每兆瓦时需要120-140美元。
The cheapest solar power now costs $120-140 per megawatt hour.
例如，它最近获得了一个订单，为中国的一个火力发电厂提供一个2.2兆瓦时，集装箱大小的电池，进行备份测试。
For example, it recently won an order to provide a 2.2 megawatt-hour battery, the size of a shipping container, for use in tests to back up a Chinese coal-fired power station.
目前为止，该能量捕捉器的功效还十分之效，小到计量单位运用的是毫瓦，而不是兆瓦，不过当其收集到足够的能量时，它能够为小型的传感器和RFID装置补给电量。
So far, the energy captured is minute - measured in microwatts and milliwatts, not megawatts - but is able to gather enough juice to power small sensors and RFID tags.
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