[To learn English] Tokyo Gas, Japan's largest city gas supplier, said on Monday it sold its U.S.-based subsidiary, TVL LLC, involved in gas development and production to Grayrock Energy for $255 million. The unit, operating in Louisiana's Haynesville and Cotton Valley formations, was sold as part of Tokyo Gas's strategy to optimise its asset portfolio, it said in a statement. 日本最大的城市燃气供应商东京燃气周一宣布，已将其位于美国的子公司TVL LLC以2.55亿美元的价格出售给Grayrock Energy。TVL LLC主要从事天然气开发和生产。 东京燃气在一份声明中表示，此次出售是其优化资产组合战略的一部分。TVL LLC在路易斯安那州的Haynesville和Cotton Valley地层开展业务。 LearnEnglishLeave a remark