For proper appreciation of the controversy involved, it would be appropriate to refer to the facts in W.P.No.3410 of 2005 in brief. The petitioner is a Company engaged in generation of electricity from Biomass. The energy generated by the petitioner is being purchased by the 1st respondent-AP TRANSCO under a Power Purchase Agreement (for short, ‘PPA') dated 16.02.2002. It is not in dispute that as per the terms and conditions of the agreement, initially the 1st respondent was purchasing the entire energy delivered by the petitioners at the rate of Rs.3.48 Ps per unit. However, from the billing month of January, 2004 onwards, the 1st respondent started deducting payment for the energy delivered by the petitioners in excess of the amount of energy corresponding to 100% PLF during the each 30 minutes time block. By a letter dated 26.06.2004, the petitioner was informed by the 1st respondent that as per the directions of the 2nd respondent-A.P. Electricity Regulatory Commission (for short, ‘APERC'), vide order dated 15.11.2003, the excess energy delivered over and above 100% PLF during the periods (i.e., 30 minutes time block) by the Non-conventional energy (NCE) Power Projects cannot be purchased. It was also informed that in view of the said order, the amount for the quantum of excess energy delivered above 100% PLF during the each 30 minutes time block for the months from December, 2003 to May, 2004, was deducted from the power purchase bill payable for the billing month of May, 2004. It was further informed that the balance of Rs.3,81,442.80 ps would be collected in the bill of June, 2004.