Section XVIII-7: Control and regulation not divested - Surrender of powers - Exclusive franchises.

  No grant, extension, or renewal of any franchise or other use
of the streets, alleys, or other public grounds or ways of any
municipality, shall divest the State, or any of its subordinate
subdivisions, of their control and regulation of such use and
enjoyment.
  Nor shall the power to regulate the charges for public services
be surrendered; and no exclusive franchise shall ever be granted.