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You hav no option other than to exit. The verdict means 1/3 of their planned capacity is going to get fuel at almost double the price, which is going to seriously affect the profitability of the business, as and when the power plants are ready. So there is no hope of the stock bouncing back, in the near future and there is a chance of sliding further. You must look at exiting around 140.
I wont even recommend shifting to other power stocks like JSW or even Tata power. In India, power sector is still over priced and trades at 2 times their PE in most developed / developing countries - which means this sector is over rated and there is a possibility of correction. Considering the capacity addion being planned all private sector companies, there could be over capacity in next few years which may again trigger a collapse. So better exit and stay away from power sector. Consider pharma midcaps / private banks for 20%-25% consistant yearly growth without much risks.