In areas where the wind dies down, backup electricity from a utility company or from an energy storage system becomes necessary.
在风能不稳定的一些地区，需要供电事业公司或者能量储存系统来提供备用电能。
2
Finally, a variety of utility classes for styling, data formats, coordinate storage, and more are available.
最后，是用于样式化、数据格式化、坐标存储等的各种实用工具类。
3
But add storage to allow a utility to deliver in the evening the solar power that was generated during the morning and afternoon, and - through the magic of storage - the figure zooms dramatically.