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How does the Ghazi Barotha project produce hydroelectric power from the Indus River?

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Physical map showing the Indus River basin and its drainage network across parts of Pakistan, India, China, and Afghanistan. The map details river courses, tributaries, canals, dams, irrigated and marsh areas, sand regions, and elevation changes with shaded relief. International, disputed, and control boundaries are marked, and a small locator map in the corner shows the basin's position within South Asia. — Indus River The Indus River basin and its drainage network.

The Ghazi Barotha hydroelectric project, completed in 2004, generates power by utilizing a partial diversion of the Indus River located downstream from the Tarbela Dam.

The project operates by diverting a portion of the river's flow into a powerhouse, which allows for the generation of 1,450 megawatts of hydroelectric power.1