At these times the generator sets must keep working continuously. But during low-demand periods, there is no way to store up the power and it simply is wasted. When winter rolls around, though you might think it offers a good chance for the machines to rest and undergo maintenance, it is economically inefficient for them to be idle for long.
發電機組往往須要終日、長期運轉，離開尖峰，進入離峰後，電力無法儲存，平白流失；進入冬季，雖說機組可以趁此稍微喘息，進行維修，但過多的閒置設備其實極不符投資效益。