1. All the writ petitions involve common questions relating to the same subject matter. Thus they are heard and disposed of jointly by the following common judgment:

2. W.P.No.22733 of 2009 is filed by the Peoples Monitoring Group on Electricity Regulation (for short PMGER), Hyderabad and by Mr M.Thimma Reddy, representing the first petitioner as its convenor against the Government of Andhra Pradesh and other parties, which include certain power generating units for a writ of mandamus declaring the action of the first respondent-Government of Andhra Pradesh therein in issuing G.O.Rt.No.135 dated 13.10.2009 and not permitting the third respondent-Andhra Pradesh Electricity Regulatory Commission to complete its enquiry on the proposed amendments to PPAS which were earlier entered into with the IIPS on truing up mechanism etc to be arbitrary, illegal and violative of Articles 14 and 21 of the Constitution of India and consequently to set aside the G.O.Rt.No.135, dated 13.10.2009.

3. W.P.No.23902 of 2009 is filed by the Communist Party of India, a National Political Party seeking the same relief.

4. Whereas the Writ Petition No.27678 of 2009 is filed by the GVK Gautami Pow