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CONSOLIDATED STATEMENT OF INCOME - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Profit (loss) [Line Items]      
REVENUE R$ 36,850 R$ 34,463 R$ 33,646
COSTS      
Cost of energy and gas (19,822) (20,020) (21,449)
Infrastructure and construction cost (4,072) (3,536) (2,036)
Costs of operation (4,572) (4,095) (3,438)
TOTAL COST (28,466) (27,651) (26,923)
GROSS PROFIT 8,384 6,812 6,723
EXPENSES      
Expected credit losses (175) (109) (144)
General and administrative expenses (707) (789) (572)
Other operating expenses (713) (1,076) (489)
Total expenses (1,595) (1,974) (1,205)
Periodic Tariff Revision, net     215
Renegotiation of hydrological risk (Law 14,052/20), net     1,032
Bargain purchase   5 4
Fair value adjustments of investments 9    
Share of income, net, of affiliates, subsidiaries and joint ventures 432 843 182
Income before financial revenue expenses and taxes, Total 7,230 5,686 6,951
Finance income 1,272 1,500 844
Finance expenses (1,651) (3,066) (3,096)
Total financial income and expenses (379) (1,566) (2,252)
Income before income tax and social contribution tax 6,851 4,120 4,699
Current income tax and social contribution tax (943) (950) (1,156)
Deferred income tax and social contribution tax (141) 924 210
Income tax and social contribution tax (1,084) (26) (946)
NET INCOME FOR THE YEAR 5,767 4,094 3,753
Total of net income for the year attributed to:      
Equity holders of the parent 5,764 4,092 3,751
Non-controlling interests 3 2 2
Total net income for the year  R$ 5,767 R$ 4,094 R$ 3,753
Preferred shares [member]      
Total of net income for the year attributed to:      
Basic earnings (loss) per share R$ 2.62 R$ 1.86 R$ 1.7
Diluted earnings (loss) per share 2.62 1.86 1.7
Common shares [member]      
Total of net income for the year attributed to:      
Basic earnings (loss) per share 2.62 1.86 1.7
Diluted earnings (loss) per share R$ 2.62 R$ 1.86 R$ 1.7