The Council, with an affirmative vote of not less than a majority plus one of the elected members, may pass emergency ordinances to take effect immediately upon their passage or at the time indicated therein in order to preserve the public interests or to provide for special emergencies in the operation of usual City services. Each emergency ordinance shall set forth the specific facts necessitating the emergency legislation. No legislation involving the levying of a tax, granting, renewing or extending a franchise or regulating the rate to be charged for public utility service shall be passed as an emergency measure.