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BASIS OF PREPARATION AND PRESENTATION OF FINANCIAL STATEMENTS - Subsidiaries (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Consrcio Energtico Cruzeiro do Sul |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 49.00% | 49.00%
Consrcio UHE Baguari |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Baguari Energia S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% |
Indirect ownership (as a percent) |  | 100.00%
Baguari I Gerao de Energia S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Brasil Ventos Energia S.A |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% |
Indirect ownership (as a percent) |  | 100.00%
Energia dos Ventos V S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Energia dos Ventos VI S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Energia dos Ventos VII S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Energia dos Ventos VIII S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Energia dos Ventos IX S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Itaguau da Bahia Energias Renovveis S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 98.00% | 98.00%
Centrais Eltricas do Norte do Brasil S.A. - Eletronorte |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% | 100.00%
Nova Era Catarina Transmissora S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% |
Nova Era Cear Transmissora S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% |
Nova Era Integrao Transmissora S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% |
Nova Era Teresina Transmissora S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% |
Teles Pires Participaes S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Companhia Hidreltrica Teles Pires S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Cia de Ger. e Trans. de Energia Eltrica do Sul do Brasil - CGT Eletrosul |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% | 100.00%
Ibirapuit Elica S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 100.00% | 100.00%
Companhia Hidro Eltrica do So Francisco - Chesf |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% | 100.00%
Nova Era Enki S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 99.97% |
Eletrobras Participaes S.A. - Eletropar |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 83.71% | 83.71%
Furnas Centrais Eltricas S.A. - Furnas |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation |  | 100.00%
Madeira Energia S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 99.74% |
Indirect ownership (as a percent) |  | 99.74%
Santo Antnio Energia S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Indirect ownership (as a percent) | 99.74% | 99.74%
Retiro Baixo Energtica S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% |
Indirect ownership (as a percent) |  | 100.00%
SPE Nova Era Janapu Transmissora S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% |
Indirect ownership (as a percent) |  | 100.00%
Tringulo Mineiro Transmissora S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 100.00% |
Indirect ownership (as a percent) |  | 100.00%
Vale do Sao Bartolomeu Transmissora de Energia S.A. |  |
FINANCIAL ASSETS AND LIABILITIES |  |
Percentage of equity interest /Percentage of participation | 90.00% |
Indirect ownership (as a percent) |  | 90.00%

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