提供備轉容量：依據電網供需的變化來增加增外的供電。當備轉容量不足時，會在數分鐘到小時內，供應一定的電力並維持一段時間（半小時到數小時）。 You are using a browser that isn't supported by Fb, so we have redirected you to definitely an easier Variation to give you the best encou