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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