January 17, 2012. The recent rupee depreciation has added to the woes of power generation companies. While some of them have hedged against an unfavourable currency movement, most companies will have to take a hit on their margins. Power companies have an exposure to foreign currency as they are dependent on imported coal due to a domestic coal supply deficit. Besides, they also have a foreign loan exposure; though most of this will be mark-to-market loss as the repayment of these loans will start only from 2013, once the projects are operational.