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18. INTANGIBLE ASSETS (Details 4)
 12 Months Ended
Dec. 31, 2020
MWh
Emboracao [member]  
Disclosure of detailed information about intangible assets [line items]  
Physical Guarantee 500
Concession extension (months) 23
Nova Ponte [member]  
Disclosure of detailed information about intangible assets [line items]  
Physical Guarantee 270
Concession extension (months) 25
Sa Carvalho [member]  
Disclosure of detailed information about intangible assets [line items]  
Physical Guarantee 56
Concession extension (months) 22
Rosal [member]  
Disclosure of detailed information about intangible assets [line items]  
Physical Guarantee 29
Concession extension (months) 46
Other [member]  
Disclosure of detailed information about intangible assets [line items]  
Physical Guarantee 399 [1]
Concession extension (months)
[1] Includes 11 power plants, of which 7 are owned by Cemig GT, 1 is owned by Cemig PCH and 3 are owned by Horizontes. The average concession extension in months varies between 1 and 84 months.