依靠天然气运行的燃料电池是由联合技术公司的一家子公司UTC电力公司制造的。
The fuel cell, which runs on natural gas, is made by UTC Power, a subsidiary of United Technologies Corporation.
能源公司常常把天然气称作纯净的燃料：燃烧天然气进入大气层的二氧化碳量大致上是煤炭的一半。
Energy firms often call gas a clean fuel: burning it releases roughly half as much carbon dioxide into the atmosphere as burning coal does.
因为毕竟，这些公司所用燃料可以免费获得，而依靠煤和天然气发电的公司，其成本不仅居高不下，而且还日益上升。
After all, their fuel is free, whereas the bills of power stations that run on coal and natural gas are high and rising.
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