运转储备 meaning in English

spinning reserve

This provides emergency back - up and achieves cost savings to consumers through economic energy transfers between the two systems and a reduction in the amount of generating capacity that needs to be kept as spinning reserve against the tripping of other units
联网系统除可提供紧急电力支援外，更可让两家电力公司进行符合经济原则的能源交流，并减低为应付其他机组出现故障所需的发电量运转储备，从而使用户节省开支。