(a) A city of the first class may, by ordinance, create a commission or commissions to operate, control, and supervise such of its municipally owned water, sewer, or light plants as may be prescribed by ordinance which are not now being operated by a commission created by or pursuant to valid special or local acts of the General Assembly.
(b) If either a municipally owned water or sewer or light plant belonging to a city of the first class is being operated at the time of the passage of this act by a commission or commissions created by or pursuant to valid special or local acts of the General Assembly, then the power of the city to create a commission shall be limited to such plants as are not now being operated by a commission created by or pursuant to valid special or local acts of the General Assembly.
(c) Nothing contained in this section shall be construed to supersede management of any such municipally owned water, sewer, or light plant under or pursuant to any valid local or special act referred to in § 14-201-201.