Itaipu hydroelectric dam aerial view with massive water release

Aerial view of the Itaipu hydroelectric dam with massive water release, showcasing its power and energy importance.

About this subject

The Itaipu hydroelectric dam, located on the border between Brazil and Paraguay, is one of the largest in the world in energy generation. Inaugurated in 1984, its construction required diverting the Paraná River and excavating 63 million cubic meters of rock and earth. The dam is 7,919 meters long and 196 meters tall, forming a reservoir that stretches over 1,350 km². In 2023, Itaipu produced about 70 million MWh, supplying approximately 10% of Brazil's consumption and 85% of Paraguay's.

The water release captured in the image occurs through spillways, structures designed to control the reservoir level and prevent flooding. During rainy seasons, such as summer, the gates are opened to relieve pressure on the dam. The released water volume can reach 40,000 m³/s, equivalent to 40 Olympic swimming pools per second. This spectacle attracts tourists from around the world, who visit the complex to witness the force of nature combined with engineering.

Beyond energy generation, Itaipu plays a crucial role in managing the water resources of the La Plata Basin. The plant operates in coordination with other hydroelectric dams in the region, such as Yacyretá, to ensure the navigability of the Paraná River and water supply for riverside communities. Maintaining local biodiversity is also a priority: the reservoir hosts environmental preservation areas, such as the Itaipu Biological Refuge, which protects endangered species like the jaguar and the broad-snouted caiman.

Interestingly, the construction of Itaipu sparked socio-environmental controversies, including the displacement of indigenous communities and the flooding of 1,350 km² of fertile land. Today, the dam is an example of binational cooperation and invests in solar and wind energy projects to diversify its matrix. The Itaipu Treaty, signed in 1973, governs operations and equal energy sharing between the two countries, being renewed in 2023 with new sustainability clauses.

Frequently Asked Questions

What is the energy generation capacity of the Itaipu dam?

Itaipu has 20 generating units, totaling 14,000 MW of installed capacity. In 2023, it generated about 70 million MWh, enough to power all of Brazil for approximately 10 days.

How does the water release at Itaipu work?

Water is released through spillways controlled by gates, which open when the reservoir level exceeds the safe limit. The flow can reach 40,000 m³/s, preventing floods and relieving pressure on the dam.

Is Itaipu the largest hydroelectric dam in the world?

No, currently the largest is the Three Gorges Dam in China, with 22,500 MW. Itaipu is the second largest, but leads in annual energy generation due to its high capacity factor (around 60%).