He says that the coal used in the past was of high quality and burned hot, so generating the necessary power wasn't a problem. However, Taiwan no longer mines its own coal, and most of the imported coal is made out of compressed coal cinders. It doesn't burn as hot, and it produces a lot of ash.
他說，過去的煤塊品質好，卡路里夠，要產生足夠的動力沒什麼問題，現在台灣不產煤了，進口的煤塊又多是煤渣結塊，卡路里含量差，煤灰也多。