该系统提供了这家商店一半的电力，支付的能源费用比类似规模商场使用相同电量向公用电力支付的费用减少30%。
It provides about half of the store's power, and the market pays 30 percent less for energy than similarly sized stores that use the same electric utility.
为了满足这一需求，公用事业单位购买稳定可用的电能总是会选择大规模而廉价的煤电厂和核电厂，它们才是电网的支柱。
To meet that need, utilities buy consistent always-on power from the large, cheap coal and nuclear power plants that are the backbone of the electric grid.
墨西哥与西班牙公用事业公司Iberdrola公司合资，正在瓦哈卡州南部建设一个大规模风力发电场。
In a joint venture with Spanish utility company Iberdrola, Mexico is building a massive wind farm in the southern state of Oaxaca.
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