** Shares of U.S. coal miners rise premarket
** President Donald Trump ordered the Defense Department late on Wednesday to purchase electricity from coal-fired power plants in his latest effort to boost the coal sector
** The move calls for the Pentagon to form purchase agreements to buy electricity from coal-fired power plants for an unspecified amount
** Trump said the Energy Department will provide six coal plants in Kentucky, North Carolina, Ohio, Virginia and West Virginia with $175 million for upgrades
** Peabody Energy BTU.N rises 5.4% and Hallador Energy HNRG.O climbs marginally
** Warrior Met Coal HCC.N up 2.3%
(Reporting by Varun Sahay in Bengaluru)
((Varun.sahay@thomsonreuters.com))