The Electricity Act Article 93

An Electricity Enterprise that engages in the electricity-generation business and is designated a public utility prior to implementation of the amendments to this Act promulgated on 11 January, 2017 may retain the rights and privileges as a public utility until the expiration of the period of operation allowed on the original licence.
中文原文 電業法第93條
本法中華民國一百零六年一月十一日修正之條文施行前,經營發電業務,經核定為公用事業之發電業者,其因屬公用事業而取得之權利,得保障至原電業執照營業年限屆滿為止。

English translation for reference only; the Chinese text prevails. Not legal advice.