Itaipu hydroelectric dam aerial view with massive water release

Aerial view of the Itaipu hydroelectric dam during a controlled spillway discharge, with millions of liters of water released per second.

About this subject

The Itaipu hydroelectric dam, located on the Paraná River at the border between Brazil and Paraguay, is one of the largest hydroelectric plants in the world by energy generation. Inaugurated in 1984, its construction required a multi-billion-dollar investment and involved the relocation of thousands of families and the creation of the Itaipu reservoir, covering 1,350 km². The image shows a controlled spillway discharge, a procedure performed when the reservoir level exceeds storage capacity or for gate maintenance. During operation, the flow can reach 40,000 m³/s, equivalent to 40 Olympic swimming pools per second. Water is released through 14 gates of the spillway, a structure 483 meters long and 150 meters high.

Itaipu supplies about 15% of Brazil's energy consumption and 86% of Paraguay's. The plant has 20 generating units, totaling 14,000 MW of installed capacity. In 2016, it set the world record for annual generation, with 103.1 million MWh. The main dam is 196 meters high and 7.7 km long, making it one of the largest concrete structures on the planet. The spillway, when in operation, creates a visual spectacle with frequent rainbows due to water nebulization.

The construction of Itaipu boosted the development of the western region of Paraná, attracting industries and generating jobs. The artificial lake also became a tourist hub, with boat tours and guided visits to the plant. However, the project had significant environmental impacts, such as the flooding of the Sete Quedas waterfall, one of the largest waterfalls in the world, and changes to the local ecosystem. Mitigation measures include reforestation programs and wildlife monitoring.

The dam is a symbol of South American integration and Brazilian engineering. Its operation is binational, with shared management between Brazil and Paraguay. The treaty that created Itaipu also established that the energy generated is divided equally between the two countries, although Paraguay sells its surplus to Brazil. The plant remains a benchmark in efficiency and innovation in the global electricity sector.

Frequently Asked Questions

What is the generation capacity of the Itaipu dam?

Itaipu has 14,000 MW of installed capacity with 20 generating units. In 2016, it set the world record for annual generation, with 103.1 million MWh.

Why does the Itaipu dam release water through the spillway?

Controlled releases are made to lower the reservoir level during floods or for gate maintenance. The flow can reach 40,000 m³/s.

How many countries benefit from Itaipu's energy?

Two countries: Brazil and Paraguay. The plant supplies about 15% of Brazil's energy and 86% of Paraguay's. Management is binational.