Improving the reliability of power supply for the 22kV and 35kV power grids after Ha Trung, Hoang Hoa, Hoang Hoa 2, Bim Son, Thieu Yen, Tho Xuan, Thach Thanh, Ngoc Lac, Nhu Thanh, Bai Tranh, Tinh Gia 2 substations according to the multi-divided - multi-connected (MDMC) plan in 2026