Optimization on Trans-regional Electricity Transmission Scale of China’s Western Renewable Energy Base: The case study of Qinghai ProvinceBin Cai, Yusheng Xue, Yue Fan, Yan Wen, Xinxin Yang, Senlin Yang, Zhiqing Li and Haiting WangE3S Web Conf., 143 (2020) 02012DOI: https://doi.org/10.1051/e3sconf/202014302012