[charging piles, power grid concept stocks quickly rebounded Shuangjie Electric rose more than 10%] on May 30, Shuangjie Electric rose more than 10%, Dinghan Technology and Englo rose more than 5%, and Tonghe Technology, Nebula shares, Trent, Xu Ji Electric and so on rose. On the news side, Shanghai issued a number of policies and measures for Shanghai to step up efforts to support private investment and development, proposing to strengthen private investment support in the field of green development and give 30% 50% equipment subsidy to charging equipment.