APTransco came into existence on 1.02.1999 as a consequence of restructuring of the erstwhile AP State Electricity Board (APSEB) to look after Transmission of Electricity in Andhra Pradesh. From Feb 1999 to June 2005 APTransco remained as Single buyer in the state -purchasing power from various Generators and selling it to DISCOMs in accordance with the terms and conditions of the individual PPAs at Bulk Supply Tariff (BST) rates.
Subsequently, in accordance with the Third Transfer Scheme notified by GoAP, APTransco has ceased to do power trading and has retained with powers of controlling system operations of Power Transmission