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LOANS, FINANCING AND DEBENTURES - Issuance of credit transactions (Details)
R$ in Thousands
Dec. 31, 2024
BRL (R$)
Expires 01/11/2035  
Disclosure of detailed information about borrowings [line items]  
Principal amount R$ 4,219,050
Eletrobras - Due 04/15/2029  
Disclosure of detailed information about borrowings [line items]  
Principal amount 1,988,895
Eletrobras - Due 04/15/2031  
Disclosure of detailed information about borrowings [line items]  
Principal amount R$ 1,019,900
Eletrobras - Due 09/15/2034  
Disclosure of detailed information about borrowings [line items]  
Interest (as a percent) 6.87%
Principal amount R$ 1,600,000
CHESF - Due 04/15/2029  
Disclosure of detailed information about borrowings [line items]  
Principal amount 1,000,000
CHESF - Due 06/15/2031  
Disclosure of detailed information about borrowings [line items]  
Principal amount 4,900,000
CHESF - Due 09/15/2031  
Disclosure of detailed information about borrowings [line items]  
Principal amount 1,336,250
CHESF - Due 09/15/2034  
Disclosure of detailed information about borrowings [line items]  
Principal amount 566,250
CGT Eletrosul - Due 04/15/2031  
Disclosure of detailed information about borrowings [line items]  
Principal amount 500,000
Eletronorte Due 09/15/2031  
Disclosure of detailed information about borrowings [line items]  
Principal amount 566,250
Eletronorte Due 04/15/2031  
Disclosure of detailed information about borrowings [line items]  
Principal amount 1,336,250
Commercial Notes Eletrobras - Due 06/15/2026  
Disclosure of detailed information about borrowings [line items]  
Principal amount R$ 2,000,000
CDI | Expires 01/11/2035  
Disclosure of detailed information about borrowings [line items]  
Interest rate 122.59%
DI | Eletrobras - Due 04/15/2029  
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.85%
DI | Eletrobras - Due 04/15/2031  
Disclosure of detailed information about borrowings [line items]  
Interest rate 1.00%
DI | CHESF - Due 04/15/2029  
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.85%
DI | CHESF - Due 06/15/2031  
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.31%
DI | CHESF - Due 09/15/2031  
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.85%
DI | CHESF - Due 09/15/2034  
Disclosure of detailed information about borrowings [line items]  
Interest rate 1.05%
DI | Eletronorte Due 09/15/2034  
Disclosure of detailed information about borrowings [line items]  
Interest rate 1.05%
DI | Eletronorte Due 09/15/2031  
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.85%
DI | Commercial Notes Eletrobras - Due 06/15/2026  
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.75%
IPCA | Eletrobras - Due 04/15/2031  
Disclosure of detailed information about borrowings [line items]  
Interest rate 6.34%
Principal amount R$ 1,000,000
IPCA | Commercial Notes Eletrobras - Due 06/15/2026  
Disclosure of detailed information about borrowings [line items]  
Interest rate 6.34%