XML 225 R204.htm IDEA: XBRL DOCUMENT
v3.21.1

30. RELATED PARTY TRANSACTIONS (Details) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 20, 2019
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  | R$ 15,456 |  | R$ 10,354 | [1] | R$ 27,796 |  |
TOTAL NON-CURRENT |  | 38,627 |  | 40,172 | [1] | 32,059 |  |
Current liabilities |  | 9,690 |  | 7,913 | [1] | 23,394 |  |
Total non-current liabilities |  | 26,915 |  | 26,458 | [1] | 20,522 |  |
Jointly-Controlled Entity [member] | Lightger [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  | (21) |  | (21) |  |
Current liabilities | [2] |  |  | 2 |  |  |  |
Jointly-Controlled Entity [member] | Hidreletrica pipoca [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  | (19) |  | (19) |  |
Current liabilities | [2] |  |  | 1 |  | 1 |  |
Jointly-Controlled Entity [member] | Cia. Transirape de Transmissao [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  |  |  |  |  |
Current liabilities | [2] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Cia. Transirape de Transmissao [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |
Expenses | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Renova [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  | 4 |  |  |  |
Expenses | [2] |  |  |  |  | (81) |  |
Current liabilities | [2] |  |  |  |  | 1 |  |
Jointly-Controlled Entity [member] | Renova [member] | Non Current [member] | Reimbursement For Cessation Of Power Purchase Agreement [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue |  | 10 |  |  |  |  |  |
TOTAL NON-CURRENT |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Total non-current liabilities |  |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Renova [member] | Non Current [member] | Reimbursement For Suspension Of Supply Of Power [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue |  | 52 |  |  |  |  |  |
TOTAL NON-CURRENT |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Total non-current liabilities |  |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Renova [member] | Non Current [member] | Advance For Future Power Supply [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [4] | 7 |  |  |  |  |  |
TOTAL NON-CURRENT | [4] |  |  |  |  |  |  |
Expenses | [4] |  |  |  |  |  |  |
Current liabilities | [4] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Renova [member] | Non Current [member] | Accounts Receivable - AFAC [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [5] | 37 |  | 94 |  | 106 |  |
TOTAL NON-CURRENT | [5] |  |  |  |  | 594 |  |
Expenses | [5] |  |  | (688) |  |  |  |
Total non-current liabilities | [5] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Renova [member] | Non Current [member] | Loans From Related Parties [Member |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [6] |  |  | 17 |  |  |  |
Revenue | [6] |  |  |  |  |  |  |
Expenses | [6] |  |  |  |  |  |  |
Current liabilities | [6] |  |  | 6 |  |  |  |
Jointly-Controlled Entity [member] | Retiro baixo [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  | 5 |  | 4 |  |
Expenses | [2] |  |  | (5) |  | (5) |  |
Current liabilities | [2] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Transudeste [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Transudeste [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |
Expenses | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Transleste [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Transleste [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |
Expenses | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Baguari energia [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  | (8) |  | (11) |  |
Current liabilities | [2] |  |  | 1 |  | 1 |  |
Jointly-Controlled Entity [member] | Baguari energia [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [3] |  |  |  |  |  |  |
Revenue | [3] |  |  | 1 |  | 1 |  |
Expenses | [3] |  |  |  |  |  |  |
Current liabilities | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | TAESA [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  | (96) |  | (109) |  |
Current liabilities | [2] |  |  | 9 |  | 8 |  |
Jointly-Controlled Entity [member] | TAESA [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  | 1 |  |
Expenses | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | TAESA [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [3] |  |  | 1 |  |  |  |
Expenses | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Madeira energia (santo antonio plant) [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  | 6 |  | 6 |  |
Revenue |  | 35 |  | 68 | [2] | 70 | [2] |
Expenses | [2] |  |  | (730) |  | (778) |  |
Current liabilities | [2] |  |  | 64 |  | 58 |  |
Jointly-Controlled Entity [member] | Madeira energia (santo antonio plant) [member] | Current [member] | Reimbursement For Decontracted Supply [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [7] |  |  | 4 |  | 42 |  |
Revenue | [7] | 2 |  | 4 |  | 2 |  |
Expenses | [7] |  |  |  |  |  |  |
Current liabilities | [7] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Madeira energia (santo antonio plant) [member] | Current [member] | Advance Against Future Electricity Supply [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [8] |  |  |  |  | 7 |  |
Revenue | [8] | 9 |  |  |  | 9 |  |
TOTAL NON-CURRENT | [8] |  |  |  |  |  |  |
Expenses | [8] |  |  |  |  |  |  |
Current liabilities | [8] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Madeira energia (santo antonio plant) [member] | Non Current [member] | Reimbursement For Decontracted Supply [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [7] |  |  |  |  |  |  |
TOTAL NON-CURRENT | [7] |  |  |  |  | 4 |  |
Expenses | [7] |  |  |  |  |  |  |
Total non-current liabilities | [7] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Light [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] | 67 |  | 98 |  | 60 |  |
Expenses | [2] | (2) |  | (9) |  | (1) |  |
Current liabilities | [2] |  |  | 1 |  | 1 |  |
Jointly-Controlled Entity [member] | Light [member] | Current [member] | Interest On Equity and Dividends [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  |  |  | 73 |  | 10 |  |
Revenue |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Alianca geracao [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue |  | 42 |  | 40 | [2] | 35 | [2] |
Expenses | [2] |  |  | (166) |  | (165) |  |
Current liabilities | [2] |  |  | 14 |  | 13 |  |
Jointly-Controlled Entity [member] | Alianca geracao [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [3] |  |  | 1 |  | 2 |  |
Revenue | [3] | 5 |  | 7 |  | 12 |  |
TOTAL NON-CURRENT | [3] |  |  |  |  |  |  |
Expenses | [3] |  |  |  |  |  |  |
Current liabilities | [3] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Alianca geracao [member] | Current [member] | Interest On Equity and Dividends [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  | 114 |  | 103 |  | 91 |  |
Revenue |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Alianca geracao [member] | Current [member] | Contingency [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [9] |  |  |  |  |  |  |
Revenue | [9] |  |  |  |  |  |  |
Expenses | [9] |  |  | (32) |  |  |  |
Current liabilities | [9] |  |  | 32 |  |  |  |
Jointly-Controlled Entity [member] | Norte Energia [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  | 22 |  | 16 |  |
Expenses | [2] |  |  | (228) |  | (202) |  |
Current liabilities | [2] |  |  | 24 |  | 23 |  |
Jointly-Controlled Entity [member] | Empresa Amazonense de Transmissao de Energia EATE [member] | Current [member] | Transactions With Energy [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [2] |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |
Expenses | [2] |  |  |  |  |  |  |
Current liabilities | [2] |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Hidreletrica cachoeirao [member] | Current [member] | Interest On Equity and Dividends [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  |  |  | 3 |  | 2 |  |
Revenue |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |
Jointly-Controlled Entity [member] | Axxiom [member] | Current [member] | Provision Of Services [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [10] |  |  |  |  |  |  |
Revenue | [10] |  |  |  |  |  |  |
Expenses | [10] |  |  |  |  |  |  |
Current liabilities | [10] |  |  | 3 |  |  |  |
Jointly-Controlled Entity [member] | Hidreletrica Itaocara [member] | Current [member] | Adjustment For Losses [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [11] |  |  |  |  |  |  |
Revenue | [11] |  |  |  |  |  |  |
Expenses | [11] |  |  |  |  |  |  |
Current liabilities | [11] |  |  | 22 |  |  |  |
Jointly-Controlled Entity [member] | Centroeste [member] | Current [member] | Interest On Equity and Dividends [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  |  |  | 1 |  | 1 |  |
Revenue |  |  |  |  |  |  |  |
Expenses |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |
Other Related Parties [member] | Forluz [member] | Current [member] | Post-Employment Obligations [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [12] |  |  |  |  |  |  |
Revenue | [12] |  |  |  |  |  |  |
Expenses | [12] |  |  | (197) |  | (192) |  |
Current liabilities | [12] |  |  | 145 |  | 123 |  |
Other Related Parties [member] | Forluz [member] | Current [member] | Supplementary Pension Contributions [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [13] |  |  |  |  |  |  |
Expenses | [13] |  |  | (78) |  | (78) |  |
Other Related Parties [member] | Forluz [member] | Current [member] | Operating Leases [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [14] |  |  | 179 |  |  |  |
Revenue | [14] |  |  |  |  |  |  |
Expenses | [14] |  |  | (55) |  | (46) |  |
Current liabilities | [14] |  |  | 35 |  | 2 |  |
Other Related Parties [member] | Forluz [member] | Current [member] | Administrative Running Costs [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue | [15] |  |  |  |  |  |  |
Expenses | [15] |  |  | (30) |  | (28) |  |
Other Related Parties [member] | Forluz [member] | Non Current [member] | Post-Employment Obligations [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [12] |  |  |  |  |  |  |
Total non-current liabilities | [12] |  |  | 2,827 |  | 2,046 |  |
Other Related Parties [member] | Cemig Saude [member] | Current [member] | Health and Dental Plans [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [16] |  |  |  |  |  |  |
Revenue | [16] |  |  |  |  | (227) |  |
Expenses | [16] |  |  |  |  | (186) |  |
Current liabilities | [16] |  |  | 141 |  | 120 |  |
Other Related Parties [member] | Cemig Saude [member] | Non Current [member] | Health and Dental Plans [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL NON-CURRENT | [16] |  |  |  |  |  |  |
Total non-current liabilities | [16] |  |  | 3,022 |  | 2,271 |  |
Other Related Parties [member] | FIC Pampulha [member] | Current [member] | Securities [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Revenue |  | 33 |  |  |  | 1,106 |  |
Expenses |  |  |  |  |  |  |  |
Other Related Parties [member] | FIC Pampulha [member] | Current [member] | Marketable securities [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  |  |  | 743 |  | 727 |  |
Revenue |  |  |  | 8 |  |  |  |
Expenses |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |
Other Related Parties [member] | FIC Pampulha [member] | Current [member] | Cash and Cash Equivalents [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  |  |  | 36 |  | 274 |  |
Current liabilities |  |  |  |  |  |  |  |
Other Related Parties [member] | FIC Pampulha [member] | Current [member] | (-) Marketable Securities Issued By Subsidiary Companies [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT |  |  |  | (3) |  | (24) |  |
Current liabilities |  |  |  |  |  |  |  |
Other Related Parties [member] | FIC Pampulha [member] | Non Current [member] | Marketable securities [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL NON-CURRENT |  |  |  | 2 |  | 101 |  |
Total non-current liabilities |  |  |  |  |  |  |  |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Current [member] | Receivables from Customers and Traders [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [17] |  |  | 346 |  | 245 |  |
Revenue |  | 127 | [18] | 166 | [17] | 163 | [17] |
Expenses | [17] |  |  |  |  |  |  |
Current liabilities | [17] |  |  |  |  |  |  |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Current [member] | ICMS Tax - Early Payment [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [19] |  |  |  |  |  |  |
Revenue | [19] | 12 |  |  |  | 11 |  |
Expenses | [19] |  |  |  |  |  |  |
Current liabilities | [19] |  |  |  |  |  |  |
Parent [member] | MINAS GERAIS STATE GOVT [member] | Current [member] | Accounts Receivable - AFAC [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
TOTAL CURRENT | [20] |  |  | 115 |  | 246 |  |
Revenue |  | R$ 27 |  | 17 | [20] | 18 | [20] |
Expenses | [20] |  |  |  |  |  |  |
Current liabilities | [20] |  |  |  |  |  |  |
[1] | See note 2.8.
[2] | The transactions in sale and purchase of energy between generators and distributors take place through auctions in the Regulated Market, and are organized by the federal government. In the Free Market, transactions are made through auctions or through direct contracting, under the applicable legislation. Transactions for transport of energy, on the other hand, are carried out by transmission companies and arise from the centralized operation of the National Grid, executed by the National System Operator (ONS).
[3] | Refers to a contract to provide plant operation and maintenance services.
[4] | Refers to advance payments for energy supply made in 2019 to Norte Energia, established by auction and by contract registered with the CCEE (Power Trading Chamber). In full-year 2020 Norte Energia S.A. will deliver contracted supply in the amount of R$40. There is no financial updating of the contract.
[5] | As mentioned in Note 18, in June 2019, due to the uncertainties related to continuity of Renova, an estimated loss on realization of the receivables was recorded for the full value of the balance in the amount of R$688.
[6] | On November 25 and December 27, 2019, DIP loan contracts under court-supervised reorganization proceedings, referred to as 'DIP' and 'DIP 2', were entered into between the Company and Renova Energia S.A., in the amounts of R$10 and R$6.5, respectively. The contracts specify interest equal to 100% of the accumulated variation in the DI rate, plus an annual spread, applied pro rata die (on 252-business-days basis), of 1.083% for the DIP contract and 2.5% for the DIP2 contract, up to the date of respective full payment. The proceeds of this loan were allocated to the investee's minimum cash needs. The contracts specify a guarantee, given by the investee and its guarantor, through surety and a fiduciary assignment on the shares of the special-purpose company Mina de Ouro, which represents 120% of the principal value of the loan, according to an independent valuation.
[7] | Refers to reimbursement due to termination of contract related to change of the "power purchase agreements" (CCEARs) between Santo Antonio Energia S.A., a subsidiary of Madeira Energia, and Cemig Distribuicao - totaling R$ 84, to be settled in 24 monthly installments, with inflation adjustment by the Selic rate and maturities up to January 2020. The outstanding amount at December 31, 2019 was R$4.
[8] | In 2017, payments of R$70 were made to Santo Antonio Energia, subsidiary of Madeira Energia: R$52 was advanced by Cemig GT; R$ 12 by Sa Carvalho; and R$ 6 by Rosal. The last installment was paid in January 2019.
[9] | This refers to the aggregate amounts of legal actions realized and legal actions provisioned arising from the agreement made between Alianca Geracao, Vale S.A. and Cemig. The action is provisioned in the amount of R$98, of which Cemig's portion is R$32.
[10] | This refers to a contract for development of management software between Cemig D and Axxiom Solucoes Tecnologicas S.A., instituted in Aneel Dispatch 2657/2017;
[11] | A liability was recognized corresponding to the Company's interest in the share capital of Hidreletrica Itaocara, due to its negative equity (see Note 18).
[12] | The contracts of Forluz are updated by the Expanded Customer Price Index (Indice Nacional de Precos ao Consumidor Amplo, or IPCA) calculated by the Brazilian Geography and Statistics Institute (IBGE) plus interest of 6% p.a. and will be amortized up to the business year of 2031 (see Note 26).
[13] | The Company's contributions to the pension fund for the employees participating in the Mixed Plan, and calculated on the monthly remuneration, in accordance with the regulations of the Fund.
[14] | Rental of the Company's administrative head offices, in effect until November 2020 (able to be extended every five years, up to 2035) and August 2024 (able to be extended every five years, up to 2034), with annual inflation adjustment by the IPCA index and price reviewed every 60 months. Aiming at costs reduction, in November 2019, Cemig returned the Aureliano Chaves building to Forluz.
[15] | Funds for annual current administrative costs of the Pension Fund in accordance with the specific legislation of the sector. The amounts are estimated as a percentage of the Company's payroll.
[16] | Post-employment obligations relating to the employees' health and dental plan (see Note 26).
[17] | Refers to sale of energy supply to the Minas Gerais State government. The price of the supply is set by the regulator (Aneel) through a Resolution relating to the annual tariff adjustment of Cemig D. In 2017 the government of Minas Gerais State signed a debt recognition agreement with Cemig D for payment of debits relating to the supply of power due and unpaid, in the amount of R$ 113, up to November 2019. Twenty installments were unpaid at December 31, 2019. These receivables have guarantee in the form of Cemig's right to retain dividends and Interest on Equity otherwise payable to the State (in proportion to the State's equity interest in the Company), for as long as any payments are overdue or in default. The amount of the Public Lighting Contribution relating to the debt recognition agreement at December 31, 2019 is R$190.
[18] | Refers to sale of energy supply to the Minas Gerais State government. The price of the supply is set by the grantor (Aneel) through a Resolution relating to the annual tariff adjustment of Cemig D. In 2017 the government of Minas Gerais State signed a debt recognition agreement with Cemig D for payment of debits relating to the supply of power due and unpaid, in the amount of R$113, up to November 2019. Twenty installments were unpaid at December 31, 2020. These receivables have guarantee in the form of Cemig's right to retain dividends and Interest on Equity otherwise payable to the State (in proportion to the State's equity interest in the Company), for as long as any payments are overdue or in default. Cemig D filed an application with the tax authority of Minas Gerais state to accept the terms of State Law 23,510/2020, to enable part of the ICMS tax payable to be offset against the debt owed by the government of Minas Gerais state to the Company. At present, the state tax authority is validating the invoices presented, to authorize the compensation of credits. As a result, the Company has reversed the amount of R$210 previously recognized as expected losses for doubtful receivables.
[19] | Refers to financial income from ICMS tax anticipation, as per Minas Gerais State Decree 47,488.
[20] | This refers to the recalculation of the inflation adjustment of amounts relating to the Advance against Future Capital Increase (AFAC), which were returned to the State of Minas Gerais. These receivables have guarantee in the form of Cemig's right to retain dividends and Interest on Equity otherwise payable to the State (in proportion to the State's equity interest in the Company), for as long as any payments are overdue or in default. For further information, see Note 13.

X
- Definition Expense for related party transactions. + References No definition available. + Details
Name: | cig_ExpenseForRelatedPartyTransactions
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue From Related Parties1 + References No definition available. + Details
Name: | cig_RevenueFromRelatedParties1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of assets that the entity (a) expects to realise or intends to sell or consume in its normal operating cycle; (b) holds primarily for the purpose of trading; (c) expects to realise within twelve months after the reporting period; or (d) classifies as cash or cash equivalents (as defined in IAS 7) unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. [Refer: Assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_i&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of liabilities that: (a) the entity expects to settle in its normal operating cycle; (b) the entity holds primarily for the purpose of trading; (c) are due to be settled within twelve months after the reporting period; or (d) the entity does not have an unconditional right to defer settlement for at least twelve months after the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_iii&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 69 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_69&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of assets that do not meet the definition of current assets. [Refer: Current assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_ii&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_NoncurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of liabilities that do not meet the definition of current liabilities. [Refer: Current liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_iv&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 69 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_69&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_NoncurrentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointControlOrSignificantInfluenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_LightgerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_TransactionsInElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_HidreletricaPipocaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_TransactionsWithEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_CiaTransirapeDeTransmissaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ProvisionOfServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_RenovaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_PastDueStatusAxis=cig_NonCurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ReimbursementForCessationOfPowerPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ReimbursementForSuspensionOfSupplyOfPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_AdvanceForFuturePowerSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_AccountsReceivable1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_LoansFromRelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_RetiroBaixoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_TransudesteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_TranslesteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_BaguariEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_TaesaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_MadeiraEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ReimbursementForDecontractedSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_AdvanceAgainstFutureElectricitySupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_LightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_InterestOnEquityAndDividendsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_AliancaGeracaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ContingencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_NorteEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_EmpresaAmazonenseDeTransmissaoDeEnergiaEateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_HidreletricaCachoeiraoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_AxxiomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_HidreletricaItaocaraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_AdjustmentForLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_CentroesteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_OtherRelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_ForluzMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_PostRetirementObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_SupplementaryPensionContributionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_OperatingLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_AdministrativeRunningCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_CemigSaudeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_HealthAndDentalPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_FICPampulhaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_SecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_MarketableSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_CashAndCashEquivalents1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_SecuritiesIssuedBySubsidiaryCompaniesOfCemigMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=cig_MinasGeraisStateGovtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ConsumersAndTradersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cig_ICMSTaxEarlyPaymentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |