Nothing in this title authorizes the commission to make or enforce any order affecting rates, tolls, rentals, contracts or charges or service rendered, or the adequacy or sufficiency of the facilities, equipment, instrumentalities or buildings, or the reasonableness of rules or regulations made, furnished, used, supplied or in force affecting any telecommunications line, gas plant, electrical plant, system of sewerage, or water system owned and operated by any city or town, or to make or enforce any order relating to the safety of any telecommunications line, electrical plant, system of sewerage, or water system owned and operated by any city or town, but all other provisions enumerated herein apply to public utilities owned by any city or town.