ISA Energia Brasil S.A. (formerly CTEEP — Companhia de Transmissão de Energia Elétrica Paulista) is the largest private operator in Brazil's electricity transmission sector, responsible for approximately 30% of all energy transmitted nationally and around 90% in the state of São Paulo. Incorporated in 1999 following the break-up of state utility CESP, the company was privatized in 2006 when Colombian group ISA acquired majority control. Listed on Brazil's B3 exchange (ISAE3/ISAE4), the company operates 23,000+ km of transmission lines and 136 substations across 18 states, with a market capitalization of approximately R$20 billion. In 2025, it deployed over R$5 billion in capital investment —...
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