ISA ENERGIA BRASIL is the leading private company in the Brazilian electric power transmission sector. Through its operations and its subsidiaries and affiliates, the Company operates in 18 Brazilian states (Rio Grande do Sul, Santa Catarina, Paraná, São Paulo, Rio de Janeiro, Minas Gerais, Rondônia, Mato Grosso, Mato Grosso do Sul, Goiás, Tocantins, Maranhão, Piauí, Paraíba, Pernambuco, Alagoas, Espírito Santo and Bahia) and is responsible for approximately 30% of all electricity transmitted through the National Interconnected System (Sistema Interligado Nacional – SIN). The coordination and control of the operation of the Company’s facilities, as well as all power generation and transmission facilities within the SIN, are carried out by the National Electric System Operator (Operador Nacional do Sistema Elétrico – ONS), under the supervision and regulation of the Brazilian Electricity Regulatory Agency (Agência Nacional de Energia Elétrica – ANEEL).
With proprietary assets and through its subsidiaries and affiliates, the Company employs more than 1,700 professionals and operates a robust transmission infrastructure with an installed transformation capacity of 82 thousand MVA, comprising approximately 23 thousand km of transmission lines, 32 thousand km of circuits and 137 substations, of which 134 are owned substations.
ISA ENERGIA BRASIL’s shares are listed on B3 S.A. under the Level 1 Corporate Governance segment, traded under the ticker symbols ISAE3 and ISAE4. The Company’s adherence to this segment since 2002 reinforces its commitment to high standards of transparency and corporate governance, facilitating the monitoring of management actions by investors, shareholders and other stakeholders. Currently, the Company is part of several market indices, including the Bovespa Index (Ibovespa B3), Brazil Broad Index (IBRA), Brazil 100 Index (IBrX100), Dividend Index (IDIV), Electric Energy Index (IEE), Corporate Governance Index (IGC), Corporate Governance Trade Index (IGCT), MidLarge Cap Index (MLCX), Public Utilities Index (UTIL), Carbon Efficient Index (ICO2), Corporate Sustainability Index (ISE), Bovespa Smart Dividend Index (IBSD), Bovespa BR+ Index (IBBR), B3 Private Companies Index (IBEP), B3 Equal Weight Index (IBEW), Bovespa Smart Low Volatility Index (IBLV), IBOV BR+ Cap 5% Index (IBBC), IBOV BR+ Equal Weight Index (IBBE) and the Diversity Index (IDVR). The Company is also a constituent of the IDIVERSA B3, the first diversity-focused index in Latin America, reflecting its commitment to inclusion and sustainability practices.
Committed to the development of Brazil’s energy infrastructure, the Company continuously invests in the maintenance and modernization of its network, directly contributing to the expansion of the national transmission system. Since 2016, the Company has been awarded 19 transmission lots in auctions held by ANEEL, totaling a weighted regulatory investment of R$ 15.8 billion and an estimated increase of approximately R$ 2.1 billion in Annual Allowed Revenue (Receita Anual Permitida – RAP) in the 2025/2026 cycle, after the assets enter into operation.
In addition to auctions, another relevant growth avenue for the Company is investment in reinforcement and improvement projects. Over the past three years, average annual investments amounted to approximately R$ 1 billion, focused on capacity expansion, transmission system reliability and asset modernization, contributing to Brazil’s energy transition. Currently, the Company has approximately R$ 6.3 billion in reinforcement and improvement projects already authorized by ANEEL, to be executed between 2026 and 2030, with a higher concentration in renewed concession contracts. These investments are fundamental to effective asset management, reduction of operating and maintenance costs, extension of asset life and sustainable value creation, with CapEx remuneration in accordance with the applicable regulatory framework.
Updated on March 26, 2026.