A municipality that has established a municipal plant shall not abandon by sale of such plant or otherwise the distribution of gas or electricity to its consumers until such sale or abandonment has been authorized in the manner and by the votes prescribed for the acquisition of such municipal plants by sections 2903 and 2904 of this title and until the Commission, after notice and a public hearing, has determined that the facilities for furnishing and distributing gas and electricity in the territory served by such plant will not thereby be diminished, and that such sale or abandonment and the terms thereof will promote the general good of the State. (Amended 1959, No. 329 (Adj. Sess.), § 39(b), eff. March 1, 1961.)