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23. REGULATORY CHARGES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Liabilities    
Global Reversion Reserve (RGR) R$ 28 R$ 31
Energy Development Account (CDE) 64 58
Grantor inspection fee - ANEEL 3 3
Energy Efficiency Program 265 255
Research and development (R&D) 225 199
Energy System Expansion Research 4 3
National Scientific and Technological Development Fund 8 6
Proinfa - Alternative Energy Program 7 8
Royalties for use of water resources 13 10
Emergency capacity charge 26 26
Customer charges - Tariff flags 90
Others 4 5
Liability 737 604
Current liabilities 446 457 [1]
Non-current liabilities R$ 291 R$ 147 [1]
[1] See note 2.8.