Porce III: Facts and figures

27 February 2008

Construction start date January 2006
Completion date 2010/2011
Total contract value US$ 920 million
Contract 1 Dam and some tunnels, US$ 240 million
Contract 2 Powerhouse and some tunnels, US$ 209 million
Dam
Concrete faced rockfill dam
Height 151 m
Width at base 400 m
Crest length 426 m
Crest width 8 m
Fill 4.15 million m3
Tunnels
Diversion tunnel 98.4 m2 in section; 653 m long
Upper headrace tunnel 86.4 m2 in section, 12.3 km long
Lower headrace tunnel 86.4 m2 in section, 304 m long
Pressure shaft 83.3 m2 in section, 149 m long
Tailrace and restoration tunnel 90.8 m2, 828m5 m long
Adits 3 x 32.1 m2, totalling 1.87 km long
Power station
Hydrostatic head 322 m
Four x 172 MW Francis turbines
Annual generation 3106 GWh
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