Qualla: Guri Dam

Guri Dam: Introduction

Mon, 09 Mar 2026 00:00:00 GMT

Photo credit NASA, Mission: STS61A, Public domain. From space, the reservoir behind Guri Dam looks like an inland sea dropped into the Venezuelan jungle -- 4,250 square kilometers of dark water stretching south from the Caroni River toward the Guiana Highlands. The dam itself, officially named the Simon Bolivar Hydroelectric Plant, generates roughly 74 percent of Venezuela's electricity. When it works, the country has power. When it falters, cities go dark from Caracas to the Colombian border.

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Image: NASA, Mission: STS61A | Public domain

Guri Dam: Canyon of Ambition

Mon, 09 Mar 2026 00:00:00 GMT

Photo credit Veronidae, CC BY-SA 3.0. The story of Guri begins in 1961, when the Harza Engineering Company conducted feasibility studies for a dam in the Necuima Canyon, about 100 kilometers upstream from where the Caroni meets the Orinoco. An international consortium of six firms won the construction contract, inclu...

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Image: Veronidae | CC BY-SA 3.0

Guri Dam: Bigger, Then Biggest

Mon, 09 Mar 2026 00:00:00 GMT

Photo credit Unknown author, CC BY-SA 3.0 nl. Venezuela's electricity demand grew so rapidly that by 1976, a second construction phase was already underway. Engineers added a gravity dam section, another spillway channel, and a second powerhouse containing ten turbines rated at 725 megawatts each. The reservoir's capacity sw...

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Image: Unknown author | CC BY-SA 3.0 nl

Guri Dam: When the Water Drops

Mon, 09 Mar 2026 00:00:00 GMT

Photo credit LuisRiera Wiki97, Public domain. The decision to make an entire nation dependent on a single river system carried risks that decades of prosperity obscured. Government policy dating back to the 1960s deliberately minimized fossil fuel power generation in order to export as much oil as possible, leaving hydroelec...

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Image: LuisRiera Wiki97 | Public domain

Guri Dam: Darkness Falls

Mon, 09 Mar 2026 00:00:00 GMT

Photo credit Venecon at English Wikipedia, CC BY-SA 3.0. The most dramatic crisis came during a massive blackout that knocked out power across most of Venezuela. The key San Geronimo B substation, which distributes an estimated 80 percent of the country's electricity, failed completely. At least four attempts to restart it were unsucce...

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Image: Venecon at English Wikipedia | CC BY-SA 3.0

Guri Dam: The Giant in the Jungle

Mon, 09 Mar 2026 00:00:00 GMT

Photo credit Heribert Dezeo, CC BY-SA 3.0. A refurbishment project has been underway since 2000, intended to extend Guri's operational life by 30 years through new turbine runners and rehabilitation of the original powerhouse units. Whether the investment can keep pace with the infrastructure's aging remains an open quest...

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Image: Heribert Dezeo | CC BY-SA 3.0