压缩空气发电站效率不高，因此它只有在电价波动大的地方才具有商业可行性。
Compressed-air plants are inefficient, and so they are commercially viable only in places where the price of power varies dramatically.
那样，花费少量的成本就能够提升电站整体的效率，因为无需追加额外的热量就能完成对煤炭的预处理。
That increases the overall efficiency of the plant at little cost, since the coal can be treated without having to generate any extra heat.
法国工程公司阿尔斯通的一位发言人说，他们正致力于一系列工作，以提高该电站的效率并减少其碳排放。
A spokesman for French engineering company Alstom said they were working on a range of initiatives to improve the wider efficiency of the plant and reduce its carbon output.
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