Power grid, railway and water conservancy "three verticals and four horizontals" means three verticals and four horizontals, thank you.

In 20 15 years, the "three vertical, three horizontal and one ring network" will be formed in the "three-oriented" UHV power grid, and the 1 1 return UHV DC transmission project will be completed. It is reported that in terms of UHV exchange projects, energy bases in Ximeng, Meng Xi, Zhangbei and northern Shaanxi send electricity to Sanhua through three vertical UHV exchange channels, while coal power in the north and hydropower in the southwest send electricity to the UHV ring network in North China, Central China and the Yangtze River Delta through three horizontal UHV exchange channels. Among them, the three verticals are: Ximeng Nanjing, Zhangbei Nanchang and northern Shaanxi Changsha. The three horizontal transmission channels are Weifang, Meng Xi, Xuzhou, Jinzhong and Weinan, Ya 'an. In addition, the double-ring network of UHV in Huainan, Nanjing, Taizhou, Jiangsu, Shanghai, northern Zhejiang, southern Anhui, Huainan and the Yangtze River Delta will be built. In terms of UHV DC project, during the Twelfth Five-Year Plan period, with the development of southwest hydropower, northwest North China coal-fired power and wind power bases, Jinping Jiangsu and other 1 1 return UHV DC transmission projects will be built, and the Qinghai-Tibet DC interconnection project will be completed to meet Tibet's power supply demand and realize the interconnection between Tibet's power grid and the northwest main grid.