The three power houses (A1, A2, A3) in Zone A are single storey, bent structure: independent foundation, reinforced concrete column, steel roof truss, masonry wall, steel roof, and the auxiliary rooms of each power house are two storey reinforced concrete frame structure. The four workshops (B1, B2, B3, B4) in Zone B are all two floors, reinforced concrete frame structure, infilled walls, and steel roof,