The Electricity Act Article 5

The Electricity Transmission and Distribution Enterprise shall be a state-owned corporation, and no more than one shall be established with its business operations covering the entire country.An Electricity-Generating Enterprise with nuclear power generation or hydroelectricity generation exceeding 20,000 kilowatts in capacity is required to be a public corporation unless the Electricity Industry Regulatory Agency approves otherwise.The “public corporation” as prescribed in the preceding paragraph refers to a corporation fully funded by the government or a joint venture between the government and the private sector with the government’s share of investment exceeding 50% of the total capital. An enterprise receiving reinvestment by public corporations is also considered a public corporation if the reinvestment exceeds 50% of the total capital.
中文原文 電業法第5條
輸配電業應為國營,以一家為限,其業務範圍涵蓋全國。
設置核能發電之發電業與容量在二萬瓩以上之水力發電業,以公營為限。
但經電業管制機關核准者,不在此限。
前項所稱公營,指政府出資,或政府與人民合營,且政府資金超過百分之五十者;由公營事業轉投資,其出資合計超過百分之五十者,亦同。

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