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Minas (San Francisco) – La Union Hydroelectric Plants, Ecuador

Minas (San Francisco) – La Union Hydroelectric Plants, Ecuador

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The project related to the Minas (San Francisco) and La Union hydroelectric plants – with total installed capacity of 365 MW – is located by the Jubones river basin located on the southeastern Ecuador, approximately 540km from the capital Quito. This valley is part of the provinces Azuay, El Oro and Loya, and is bounded on the north by the valley of the rivers Zamora, Tengel and SIete; on the south by the basin of the rivers Zamora, Puyang, Rio Negro and Buena Vista, on the east by the basin of the Rio Zamora and on the west by the Pacific Ocean. The hydrographic basin of the Jubones river drains an area totalling 4.362km2

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Additional Info

  • Owner: Enerjubones
  • Period of activity: 2009 – 2010
  • Description of the works: Two consecutive hydroelectric plants on the Jubones river, and a storage basin with a volume of more than 6 million m3 formed by a concrete rolled gravity dam 78 m high on the confluence of the San Francisco River. The first plant (Minas-San Francisco) consists of an intake tunnel, a 13.780 m long low pressure diversion tunnel (4.5 m diameter), 70 m high stand pipe piezometer, penstock with diam 3.55 m, caverns for power plant and 1,640 m long discharge tunnel . Technical data of this first plant are: capacity of 65 m3/s, water fall of 500 meters, installed capacity of 275 MW and annual production of 1,300 GWh/year. Waters discharged by the first plant are subsequently collected to be used in the second plant (La Union) which consists of a 12,270 m long diversion tunnel (diam 4.8 m), 100 m high stand pipe piezometer, 800 m long penstock with a diameter of 4.8 m, power station and discharge tunnel. Technical data of this second plant are: capacity of 65 m3/s, 170 m water fall, installed capacity of 90 MW and annual production of 400 GWh / year.
  • Geodata activity: Feasibility study and Final Design
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