variable cost of the production ofpower, thus, started to increase. The defendant no.1 was, therefore, finding it increasingly difficult to run itspower plant on Biomass, as stipulated by the applicant for availing the loan and interest subsidy, and for supply of thepower to TNEB at Rs.3.15per kwh. Even after the said rise in the variable cost, the defendant no. 1 continued to run its power plant on Biomass. It is fufther submitted that thereafter, the feasibility of running thepowerplant was under question as a direct result, firstly of the steep rise of raw materials and secondly, due to unavailability of the said raw materials at times. The defendant no. 1 was, thus, compelled by extraneous circumstances, which were clearly out of the said defendant's control, to contemplate termination of the PPA with the TNEB so that the power can be sold in the open market to power traders. This w?y, it was envisaged, that the defendant no. I would be able to recover the increased costs ofgeneration ofpower. Since, the TNEB did not revise the tariff under the PP& of Rs.3.15 per kWh, the defendant no. 1, with no other option and to safeguard the huge investments already incurred in setting up and running of the power plant, first sought the termination of the PPA with the TNEB vide a letter/ notice dated 26.04.2008, and thereafter sought to run the plant on fossil fuel. However, notwithstanding the same, the defendant no. I has, throughout the term of its functioning til! date, been well within the 25o/o cap placed on the use of fossil fuels, under the scheme for implementation of Biomass Energy and Co-generation programmes. It is submitted that in the above said notice of termination of the Power Purchase Agreement (PPA) the defendant no. t highlighted that due to abrupt increase in the pricgl of materials used of (,\