All grants shall be subject to the right of the city, whether in terms reserved or not, to control at all times the distribution of space in, over, under or across all streets, alleys or public grounds occupied by public utility fixtures, and, when in the opinion of the city commission the public interest so requires, such fixtures may be caused to be reconstructed, relocated, altered or discontinued; and said city shall at all times have the power to pass all regulatory ordinances affecting such utilities which in the opinion of the city commission are required in the interest of the public health, safety or accommodation.