Tractebel Energia (BM&F Bovespa: ) is a major Brazilian utility company, headquartered in Florianópolis, Santa Catarina. It is the largest private electricity producer in Brazil. Its 11 plants, six of them hydroelectric and the remainder thermal, have an installed capacity of 6,977 MW in operations ave an installed capacity of around 9,000 MW. Tractebel Energia's major shareholder is GDF Suez S.A., the Paris-based utility company, via its Suez-Tractebel unit.
The company originated as Gerasul, short for Centrais Geradoras do Sul do Brasil SA ('Power plants of the South of Brazil' in English) which was sold to Tractebel by Brazil's Eletrosul in 1998. Gerasul held Eletrosul's power generation assets in the southern Brazilian states of Santa Catarina, Rio Grande do Sul, Paraná and Mato Grosso do Sul. Gerasul changed its name to Tractebel Energia in 2002.
Suez-Tractebel owns around 68% of Tractebel Energia stock, which is traded on BM&F Bovespa.