Hydroelectric Generation System

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The preceding diagram shows the main facilities of the two phases of the Taquesi River Hydroelectric Complex. The first phase of the project comprises an intake – downstream from the confluence of the Kholani and Taquesi rivers-, a canal leading the water into a forebay at Pongo Pampa, penstocks connected to the forebay and two generating units with a total capacity of 850 kW. The same water transportation system also feeds four additional generating units that supply electric energy to IMCO, a mining company that operates in the area.

The second phase of the project comprises the generating plants at Chojlla and Yanacachi Norte.

The Chojlla Plant complex is composed by the Kacapi diversion weir, with an impounding capacity of around 110,000 m3, a 3.7 km. tunnel, a penstock with a 580 mt. head, which is the highest in the world for Francis turbines. The powerhouse at Chojlla has a single unit with a generation capacity that exceeds of 37 MW. The Yanacachi Plant has a weir and a daily regulation reservoir with a capacity of 45,000 m3. This reservoir connects with an approximately 3.8 km long tunnel, through a covered canal, approximately 400 m. long and discharges into a penstock with a 520 m. headl. The turbine-generator unit has a capacity of more than 51 MW.

Approximately 16 km. of 115 kV transmission lines transport the electric energy generated at the Chojlla and Yanacachi Norte Plants to the Pichu Substation, which is the connection point with the National Interconnected Grid.

Beginning of Commercial Operations

Commercial operations of the second phase of the Taquesi River Hydroelectric Project began on June 19, 2002. Until then the two small reconditioned plants corresponding to the first phase of the project, had been operating, since 1998.

As of June 19, 2002, the new Chojlla and Yanacachi Norte Plants started to delivering their power to the National Interconnected System. Besides being a very important accomplishment for Hidroeléctrica Boliviana, this date also constitutes a milestone in the history of power generation in Bolivia. As a matter of fact, with the Taquesi project, Bolivia has, for the first time, a totally private actor funded by the Bolivian Stock Exchange, and the first to use internal savings to finance infrastructure works. On the other hand, the Taquesi project shows that the bet on renewable energy is possible at a time when hydrocarbons resources seem to dominate the national energetic balance. Finally, the investment made in the second phase of the Taquesi Project constitutes the largest financial effort made by a single project in the history of power generation in Bolivia.