RFP FOR THE APPOINTMENT OF ONE (1) CONTRACTOR PER CLUSTER FOR THE IMPLEMENTATION OF AN AUTOMATED METER READING (AMR) SYSTEM, INCLUDING BILLING SOFTWARE, FOR A PERIOD OF TWELVE (12) MONTHS, TOGETHER WITH A CONCURRENT SIXTY (60) MONTH OPERATIONAL SUPPORT SERVICES CONTRACT, ACROSS ACSA AIRPORTS CATEGORISED INTO CLUSTER WORK PACKAGES A, B AND C.