Effective hydropower in Ethiopia
When completed, the GD3 Hydropower Project will have a total installed generating capacity of 254 MW. Three vertical Francis turbine generators, each having a generating capacity of 84.7 MW, are housed in an underground cavern with the main unit transformers housed in an adjacent cavern. A 500-m long cable tunnel leads to the 230kV/400kV switchyard located above ground.
The concrete faced rockfill dam is 110m high with a crest length of 456m, creating a reservoir volume of 3.2 million m3. The spillway is an open chute type with an ogee weir crest and three radial spillway gates. The mid-level outlet is a 679m long tunnel with a radial gate and a maintenance gate. A 60-m high power intake structure with vertical sliding gate lies at the entrance to the 12.4-km long, 8.1-m diameter, headrace tunnel (10.5km excavated by TBM) which supplies water to the powerhouse through a 188-m deep vertical shaft, steel lined penstock and manifold tunnels. Water returns to the river through the 820m long tailrace tunnel and 480m long open channel.
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