A municipality that has an existing municipal plant may expand such plant or may purchase or take, in the manner prescribed in N.H. Rev. Stat. § 38:6-11 and N.H. Rev. Stat. § 38:33, all or a portion of such plant owned by a utility which is necessary for expanded municipal utility service. Such action shall not require any further vote under N.H. Rev. Stat. § 38:3, 38:4, or 38:5.