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LOANS, FINANCING AND DEBENTURES - Additional Information (Details) R$ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2023 BRL (R$) | Sep. 30, 2023 BRL (R$) item shares | Jun. 30, 2023 BRL (R$) | May 31, 2020 BRL (R$) | Dec. 31, 2023 BRL (R$) | Dec. 31, 2022 BRL (R$) | Dec. 31, 2021 BRL (R$) | Jul. 01, 2023
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Fund raised |  |  |  |  | R$ 11,821,045 | R$ 8,500,000 | R$ 4,828,697 |
Number of notes issued |  | 7,000,000 |  |  |  |  |  |
Equity interest |  |  |  |  | 32,100,302 | 32,224,264 |  |
Payment of loans and financing and debentures - principal |  |  |  |  | 13,763,329 | R$ 6,734,696 | R$ 8,175,960 |
Provision for guarantees in noncurrent liabilities |  |  |  |  | R$ 153,945 |  |  |
Minimum |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Percentage of equity interest guaranteed |  |  |  |  | 1.00% |  |  |
Maximum |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Percentage of equity interest guaranteed |  |  |  |  | 5.00% |  |  |
Furnas [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 100.00% | 99.67% |  |
CGT Eletrosul |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 100.00% | 99.96% |  |
Eletronorte |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Payment term |  |  | 5 years |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 100.00% | 99.69% |  |
Debentures of the first series |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  | R$ 4,000,000 |  |  |  |  |  |
Debentures of the second series |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  | R$ 3,000,000 |  |  |  |  |  |
Banco Itau | Eletronorte |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Fund raised |  |  | R$ 820,000 |  |  |  |  |
Bank of Brasil, CDI Interest Rate Plus 2.0% p.a | Furnas [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Fund raised |  |  |  |  | R$ 680,000 |  |  |
Bank Credit Notes (CCB) | CGT Eletrosul |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Fund raised |  |  |  | R$ 1,000,000 |  |  |  |
Extended term of borrowings |  |  | 5 years |  |  |  |  |
Bank Credit Notes (CCB) | CGT Eletrosul | CDI |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest rate |  |  | 2.62% |  |  |  |  | 2.17%
Bank Credit Notes (CCB) | Eletronorte |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Fund raised |  |  | R$ 140,000 |  |  |  |  |
Bank Credit Notes (CCB) | Eletronorte | CDI |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest rate |  |  | 2.00% |  |  |  |  |
Export Credit Note | Eletronorte |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Fund raised |  |  | R$ 680,000 |  |  |  |  |
Interest rate |  |  | 2.20% |  |  |  |  |
Amazonas, First Issue Of Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  |  | R$ 180,555 |  |  |  |  |
Amazonas, First Issue Of Debentures | CDI |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest rate |  |  | 2.75% |  | 2.17% |  |  |
Eletronorte, Second Issue Of Debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Extended term of borrowings |  |  | 5 years |  |  |  |  |
Value of notes issued |  |  | R$ 333,333 |  |  |  |  |
Eletronorte, Second Issue Of Debentures | Eletronorte | CDI |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Interest rate |  |  | 2.60% |  |  |  |  |
Eletrobras fourth issue of simple debentures |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Number of debentures issued | shares |  | 7,000,000 |  |  |  |  |  |
Number Of series for issuance of debentures | item |  | 2 |  |  |  |  |  |
Value of notes issued |  | R$ 7,000,000 |  |  |  |  |  |
Value of Financing |  | R$ 1,000 |  |  |  |  |  |
Furnas first issue of commercial paper |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Number of notes issued |  | 3,500,000 |  |  |  |  |  |
Number Of series for issuance of notes | item |  | 5 |  |  |  |  |  |
Value of notes issued |  | R$ 3,500,000 |  |  |  |  |  |
Furnas - Maturity 23/08/2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Number of notes issued |  | 500,000 |  |  |  |  |  |
Furnas - Maturity 23/08/2026 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  | R$ 500,000 |  |  |  |  |  |
Furnas - Maturity 23/08/2027 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  | 1,000,000 |  |  |  |  |  |
Furnas - Maturity 23/08/2027 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  | 500,000 |  |  |  |  |  |
Furnas - Maturity 23/08/2028 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Value of notes issued |  | R$ 1,000,000 |  |  |  |  |  |
Eletrobras - Commercial Paper, Maturity October 2023 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
Payment of loans and financing and debentures - principal | R$ 6,284,425 |  |  |  |  |  |  |

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