An activated authority shall have the power to levy additional taxes in excess of the constitutional and/or statutory tax limitations for any of the authorized purposes of such activated authority, not in excess of twenty-five cents per thousand dollars of assessed value a year when authorized so to do by the electors of such authority by a three-fifths majority of those voting on the proposition at a special election, to be held in the year in which the levy is made, in the manner set forth in Article VII, section 2 (a) of the Constitution of this state, as amended by Amendment 59 and as thereafter amended. Nothing herein shall be construed to prevent holding the foregoing special election at the same time as that fixed for a general election. The expense of all special elections held pursuant to this section shall be paid by the authority.