UK energy provider SSE Plc said on Thursday that it is proposing to close its last coal-fired power plant in the country by March 2020, amid a national and international drive for lower-carbon sources of electricity generation. SSE plans to shut down all remaining operational units its Fiddler’s Ferry Coal-Fired Power Station in Warrington, Cheshire, in northwest England. The company said in March this year that it would close one of those units, but now, after a comprehensive review, it proposes to close the whole coal-fired site…