The group, majority owned by Ukrainian billionaire Kostyantin Zhevago, said this month's total pellet production was expected to be 140,000 tonnes lower than previous estimates.
Ukraine has been hit by an electricity supply crisis on the back of a shortage in thermal coal stocks at its power stations.
If the power supply situation remains unchanged into the first quarter of 2015, Ferrexpo said it would focus on production of its 65 percent Fe premium pallets and on meeting its long-term supply contract obligations.