The Estreito Hydroelectric Plant is located in the city of Estreito, in Maranhão, taking advantage of the hydroelectric potential of the Tocantins River, 766 km from São Luís.
The plant is capable of generating up to 1,087 MW of power, enough to meet the demand of a city with 4 million inhabitants, although the average energy generated is 641.1 MW.
The work began in 2007 and opened on October 17, 2012, at a cost of 5 billion reais