Rates for electrical services supplied by the city power department shall hereafter be established in rate schedules which may be promulgated hereafter by resolution of the municipal council of the city, with approval of the mayor, and such rate schedules so established shall be the uniform and official electric rates for the city power department until superseded. Copies of such rate schedules shall be maintained at all times in the office of the city recorder and shall at all times during normal office hours be available for inspection by the public. (Prior code § 8-5-4)