In December 1978 there was a PCB (polychlorinated biphenyl) poisoning incident in Taiwan, and around that time the use of PCBs began to be phased out worldwide. Because TaiPower used large numbers of capacitors and transformers containing PCBs it came under pressure from both the Control Yuan and the EPA.
民國六十七年十二月，國內發生多氯聯苯中毒事件，全球也開始淘汰這類產品，台灣電力公司由於使用大量含有多氯聯苯的電容器與變電器，因此受到監察院和環保署的層層監督壓力。