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Operating Segments - Schedule of Operating Revenues, Costs and Expenses (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
Number
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
BRL (R$)
IfrsStatementLineItems [Line Items]      
NET REVENUE R$ 39,820 R$ 36,850 R$ 34,463
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (21,978) (19,822) (20,020)
COSTS AND EXPENSES      
Personnel (1,413) (1,308) (1,352)
Employees and managers' income sharing (159) (157) (83)
Post-employment obligations (484) (591) (626)
Materials, outsourced services and others expenses (revenues) (2,813) (2,228) (2,370)
Depreciation and amortization (1,376) (1,274) (1,182)
Operating provisions and impairment (135) (609) (456)
Construction costs (5,002) (4,072) (3,536)
Other revenues 3,195 327 57
Total costs and expenses of operation (8,187) (10,239) (9,605)
COSTS AND EXPENSES (30,165) (30,061) (29,625)
Share of profit of equity-accounted investees and joint ventures, net of taxes 224 432 843
Gains arising from the sale of non-current asset held for sale   9  
Fair value of business combination   (5)
Income before financial revenue (expenses) and taxes 9,879 7,230 5,686
Finance net income (expenses) (521) (379) (1,566)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 9,358 6,851 4,120
Income tax and social contribution tax (2,239) (1,084) (26)
NET INCOME FOR THE YEAR 7,119 5,767 4,094
Equity holders of the parent 7,117 5,764 4,092
Non-controlling interests R$ 2 3 2
Number Of Reportable Segments | Number 6    
Operating Segments [Member] | Energy Generation Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE R$ 2,919 2,875 2,661
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (383) (347) (331)
COSTS AND EXPENSES      
Personnel (150) [1] (148) (162)
Employees and managers' income sharing (18) (16) (15)
Post-employment obligations (51) (59) (66)
Materials, outsourced services and others expenses (revenues) (249) (223) (395)
Depreciation and amortization (325) (327) (328)
Operating provisions and impairment 8 [2] (29) (18)
Construction costs  
Other revenues 43    
Total costs and expenses of operation (742) (802) (984)
COSTS AND EXPENSES (1,125) (1,149) (1,315)
Share of profit of equity-accounted investees and joint ventures, net of taxes (2) (2)
Gains arising from the sale of non-current asset held for sale    
Fair value of business combination  
Income before financial revenue (expenses) and taxes 1,794 1,724 1,344
Finance net income (expenses) (180) (11) (150)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,614 1,713 1,194
Income tax and social contribution tax (334) (326) (307)
NET INCOME FOR THE YEAR 1,280 1,387 887
Equity holders of the parent 1,280 1,387 887
Non-controlling interests  
Operating Segments [Member] | Energy Transmission Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 1,293 1,091 1,195
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID  
COSTS AND EXPENSES      
Personnel (149) (137) (135)
Employees and managers' income sharing (16) (16) (11)
Post-employment obligations (32) (36) (42)
Materials, outsourced services and others expenses (revenues) (97) (88) (96)
Depreciation and amortization (9) (1)
Operating provisions and impairment 5 (14) (3)
Construction costs (290) (172) (291)
Other revenues 1,521    
Total costs and expenses of operation 933 (464) (578)
COSTS AND EXPENSES 933 (464) (578)
Share of profit of equity-accounted investees and joint ventures, net of taxes 3
Gains arising from the sale of non-current asset held for sale    
Fair value of business combination    
Income before financial revenue (expenses) and taxes 2,226 627 620
Finance net income (expenses) (108) (48) (96)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 2,118 579 524
Income tax and social contribution tax (557) (114) (174)
NET INCOME FOR THE YEAR 1,561 465 350
Equity holders of the parent 1,561 465 350
Non-controlling interests  
Operating Segments [Member] | Energy Trading Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 7,279 7,686 7,918
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (6,509) (6,318) (6,880)
COSTS AND EXPENSES      
Personnel (29) (27) (12)
Employees and managers' income sharing (2) (3) (6)
Post-employment obligations (7) (8) (10)
Materials, outsourced services and others expenses (revenues) (26) (18) (14)
Depreciation and amortization
Operating provisions and impairment (76) (7) (34)
Construction costs
Other revenues    
Total costs and expenses of operation (140) (63) (76)
COSTS AND EXPENSES (6,649) (6,381) (6,956)
Share of profit of equity-accounted investees and joint ventures, net of taxes  
Gains arising from the sale of non-current asset held for sale    
Fair value of business combination    
Income before financial revenue (expenses) and taxes 630 1,305 962
Finance net income (expenses) 24 82 34
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 654 1,387 996
Income tax and social contribution tax (136) (428) (314)
NET INCOME FOR THE YEAR 518 959 682
Equity holders of the parent 518 959 682
Non-controlling interests  
Operating Segments [Member] | Energy Distribution Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 26,617 23,348 20,919
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (14,735) (12,656) (11,938)
COSTS AND EXPENSES      
Personnel (968) (875) (913)
Employees and managers' income sharing (104) (102) (40)
Post-employment obligations (323) (400) (421)
Materials, outsourced services and others expenses (revenues) (2,295) (2,157) (1,786)
Depreciation and amortization (922) (834) (738)
Operating provisions and impairment (8) (455) (398)
Construction costs (4,379) (3,600) (3,193)
Other revenues    
Total costs and expenses of operation (8,999) (8,423) (7,489)
COSTS AND EXPENSES (23,734) (21,079) (19,427)
Share of profit of equity-accounted investees and joint ventures, net of taxes  
Gains arising from the sale of non-current asset held for sale    
Fair value of business combination    
Income before financial revenue (expenses) and taxes 2,883 2,269 1,492
Finance net income (expenses) (17) (253) (1,115)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 2,866 2,016 377
Income tax and social contribution tax (662) (405) 67
NET INCOME FOR THE YEAR 2,204 1,611 444
Equity holders of the parent 2,204 1,611 444
Non-controlling interests  
Operating Segments [Member] | Gas Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 3,477 3,618 3,690
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (2,127) (2,237) (2,735)
COSTS AND EXPENSES      
Personnel (73) (73) (66)
Employees and managers' income sharing
Post-employment obligations
Materials, outsourced services and others expenses (revenues) (83) (63) (57)
Depreciation and amortization (98) (94) (91)
Operating provisions and impairment (1) 2
Construction costs (333) (300) (52)
Other revenues    
Total costs and expenses of operation (588) (528) (266)
COSTS AND EXPENSES (2,715) (2,765) (3,001)
Share of profit of equity-accounted investees and joint ventures, net of taxes  
Gains arising from the sale of non-current asset held for sale    
Fair value of business combination    
Income before financial revenue (expenses) and taxes 762 853 689
Finance net income (expenses) (52) (9) (9)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 710 844 680
Income tax and social contribution tax (213) (248) (199)
NET INCOME FOR THE YEAR 497 596 481
Equity holders of the parent 495 593 479
Non-controlling interests 2 3 2
Operating Segments [Member] | Investees Segment [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE 131 18 7
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID (86) (4) (1)
COSTS AND EXPENSES      
Personnel (44) (48) (64)
Employees and managers' income sharing (19) (20) (11)
Post-employment obligations (71) (88) (87)
Materials, outsourced services and others expenses (revenues) (97) 275 (84)
Depreciation and amortization (22) (18) (25)
Operating provisions and impairment (63) (106) (3)
Construction costs
Other revenues 1,631    
Total costs and expenses of operation 1,315 (5) (274)
COSTS AND EXPENSES 1,229 (9) (275)
Share of profit of equity-accounted investees and joint ventures, net of taxes 224 434 842
Gains arising from the sale of non-current asset held for sale   9  
Fair value of business combination   (5)
Income before financial revenue (expenses) and taxes 1,584 452 579
Finance net income (expenses) (188) (140) (230)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX 1,396 312 349
Income tax and social contribution tax (337) 437 901
NET INCOME FOR THE YEAR 1,059 749 1,250
Equity holders of the parent 1,059 749 1,250
Non-controlling interests  
Eliminations [Member]      
IfrsStatementLineItems [Line Items]      
NET REVENUE (1,896) [3] (1,786) (1,927)
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID 1,862 1,740 1,865
COSTS AND EXPENSES      
Personnel  
Employees and managers' income sharing  
Post-employment obligations  
Materials, outsourced services and others expenses (revenues) 34 46 62
Depreciation and amortization  
Operating provisions and impairment  
Construction costs  
Other revenues    
Total costs and expenses of operation 34 46 62
COSTS AND EXPENSES 1,896 1,786 1,927
Share of profit of equity-accounted investees and joint ventures, net of taxes  
Gains arising from the sale of non-current asset held for sale    
Fair value of business combination    
Income before financial revenue (expenses) and taxes
Finance net income (expenses)  
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX
Income tax and social contribution tax  
NET INCOME FOR THE YEAR
Equity holders of the parent  
Non-controlling interests  
[1]

The information on operational costs and expenses separated by type is segregated in accordance with the internal business model, which has immaterial differences in relation to the accounting information.
[2]

Includes the impairment loss on Cemig GT’s investment in Aliança Norte, disclosed in Investees Segment.
[3]

The reconciliation between the values of the reportable segments and the accounting information on revenues and costs reflects the elimination of intercompany transactions.