1. All these Writ Petitions have been filed, challenging the proceedings of the Chief Engineer, NCES, TANGEDCO, Chennai, dated 16.11.2010, and the consequential proceedings, dated 25.06.2011, in respect of demand of O&M charges for the petitioners' Wind Energy Generators, and to quash the same.

2. Since all these Writ Petitions involve a common question of law, they are being disposed of in common. For the sake of disposal, let me take the facts in W.P.No.18799 of 2011.

2.1. The petitioner is a 50 year old business enterprise, which is among the most well respected industrial houses in the country. It is engaged in the manufacture of various types of cement known for its quality in India as well as other parts of the world. The current annual production of the petitioner is in the order of 6 million tonnes with annual turnover exceeding Rs.1000 crores and the product is marketed not only in the southern States but also in other regions. The company is one of the major exporters of cement to various parts of the world, particularly, Sri Lanka, Bangladesh and South Africa. For the said purposes, it has set up its cement factory at RR Nagar, Virudhunagar District, Tamil Nad