- CEO
- Rui Chammas
- Full Time Employees
- 1,400
- Sector
- Utilities
- Industry
- Independent Power Producers
- Address
- Crystal Tower São Paulo SP Brazil 04794-000
- IPO Date
- Jan 20, 2010
- Business
- Companhia de Transmissão de Energia Elétrica Paulista S.A. (CTEEP), operating as ISA Energia Brasil, engages in the electric power transmission business in Brazil as one of the main private concessionaires responsible for transmitting approximately 30% of the country's electricity and nearly 100% of the state of São Paulo's supply. The company owns and operates an extensive transmission network comprising 12,993 kilometers of transmission lines, 18,782 kilometers of circuits, 2,488 kilometers of fiber optic cables, and 106 substations with voltages up to 550 kV and a total installed capacity of 45,131 MVA; it also manages additional circuits and substations under construction or joint control, totaling over 31,000 kilometers of circuits and 137 substations. Its services encompass high-voltage electric power transmission, network maintenance and modernization, infrastructure renewal projects, and innovation initiatives including advanced power flow control technologies; these activities support renewable energy integration, load growth, and grid reliability across residential, industrial, commercial, and generation customer segments.
Founded in 1999 from the breakup of Companhia Energética de São Paulo and headquartered in São Paulo, Brazil, the company operates in 18 states including São Paulo, Rio Grande do Sul, Santa Catarina, Paraná, Minas Gerais, Rondônia, Mato Grosso, Mato Grosso do Sul, Goiás, Tocantins, Maranhão, Piauí, Paraíba, Pernambuco, Alagoas, Espírito Santo, and Bahia. It is controlled by Colombian firm Interconexión Eléctrica S.A. (ISA), which holds approximately 35.82% to 89.4% of voting shares, and trades on the B3 exchange under tickers ISAE3 and ISAE4. Subsidiaries or affiliates include entities like Evrecy Participações Ltda. for specific transmission assets.
Recent developments include the signing in 2024 of Brazil's first large-scale advanced power flow control project with Smart Wires, deploying modular static synchronous series compensators (SmartValve) in 2025 on 138 kV circuits near Ribeirão Preto, with relocation planned to São José do Rio Preto and Votuporanga substations by 2027 to unlock grid capacity for load growth and renewables. In November 2025, the company energized the first block of the Piraquê greenfield transmission project in northern Minas Gerais, a R$3.7 billion initiative from the 2022 ANEEL auction to enhance renewable energy evacuation; it also inaugurated an advanced firefighting base with thermal cameras in São José do Rio Preto substation and advanced ISO 14001 environmental certification to 83 substations plus headquarters. During COP30 in 2025, ISA Energia Brasil partnered with FGV and EPE on a climate resilience PD&I project for transmission assets, joined a global initiative on granular electricity carbon emission factors led by State Grid China, tested Prysmian’s E3X cable technology to boost aerial line capacity by up to 25%, and earned recognition as one of B3’s top 30 sustainable companies across ISE, ICO2, and IDIVERSA indices. Earlier efforts featured record R$784.4 million investments from January to September 2023 in infrastructure renewal, including line expansions for Guarulhos Airport and ceramics industry support.