Bakun Dam - Technical Specifications

Technical Specifications

The permanent dam components are as follows:

  • Main dam
    • Maximum height above foundation of 205 m, and crest length of 750 m, volume of fill is 16.71 million m³.
    • Crest elevation is 235 m above sea level (ASL), maximum flood level is 232 m, operating levels maximum 228 m and minimum 195 m.
    • Reservoir area at 228 m ASL is 695 km², and with a catchment area of 14,750 km². Gross storage volume is 43,800 million cubic meters.
  • Power intake structure - 8 bays with 16 roller gates.
  • Gated spillway - gated concrete weir with chute and flip bucket, with capacity of 15,000 cubic meter per second.
  • Power tunnels - 8 tunnels of 8.5 m diameter each with lengths of 760 m each.
  • Powerhouse
    • Surface powerhouse, with 4 level measuring 250 m length x 48 m width × 48 m height
    • with 8 penstocks to powertrains comprising 8 vertical shaft Francis turbines of 300 MW each, 8 air-cooled generators of 360 MVA each and 8 oil-immersed transformers of 360 MVA each.

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