Central China's Hunan province has issued an implementation opinion on promoting the use of new-energy vehicles, the China Securities Journal reported on Monday, quoting the Ministry of Science and Technology. In the Changsha-Zhuzhou-Xiangtan region, Hunan plans to promote the use of 6,100 new-energy vehicles between 2013-2015. Meanwhile, it will encourage other cities to promote the uses of the vehicles, including hybrid-powered public buses.