China Longyuan Power Group, Asia’s largest wind farm developer, unveiled a 5.7 per cent rise in interim profit, with rising wind power profit largely making up for the lower profit from coal-fired power due to higher coal costs. The firm, a unit of China Guodian Group, one of the nation’s big five state-owned power generation majors, recorded a net profit of 2.42 billion yuan for the year’s first six months, up from 2.28 billion yuan in the same period last year. The profit is...