U.S. liquefied natural gas producers face an unlikely challenge as they prepare to enter global markets: China has more than it needs. The Asian nation will accept only 77 percent of contracted cargoes in 2015 as the slowest economic growth since 1990 cuts demand, according to industry consultant IHS Inc. The rest of the supply will be put up for sale amid a worldwide glut that Goldman Sachs Group Inc. says is likely to force U.S. export projects to operate at half capacity. The U.S. and China are seeking to sell cargoes just as new output equivalent to more than a third of global demand is set to flood the market over the next three years. While producers face more competition, the supply surge is a bonanza for the world’s biggest buyers , including Japan, who are benefiting from the lowest prices since at least 2010. “Chinese buyers have […]