A study in the journal Nature Energy of June 20, 2016, states that China is on track to generate more than a quarter of its electricity from wind power by 2030. As of 2015, China's 145GW of installed wind capacity eclipsed both Europe and the U.S. and within 14 years more new generating capacity – mostly clean energy – will come online in China than currently exists in the entire U.S. The Guardian quoted the co-author of the Nature Energy 's study as saying "China is now the world's wind energy leader by a fairly large margin. With more extensive reforms leading China to transition to spot markets and allowing electricity providers to reflect the marginal costs of wind generation, China's clean energy potential could be further increased."