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2. BASIS OF PREPARATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of expected impact of initial application of new standards or interpretations [abstract] |
Statement of financial position | The main effects of these changes on the accounting policy in accordance with IAS 08 – Accounting Policies, Changes in Accounting Estimates and Errors on the restated financial statements as of December 31, 2019 and January 01, 2019 are as follows:
Statement of financial position |  | December 31, 2019 |  | January 01,2019
|  | As presented |  |  | Reclassification |  | Adjustment |  | Restated |  | As presented |  | Reclassification |  | Adjustment |  | Restated
CURRENT ASSET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concession financial assets (1) |  |  | 1,080 |  |  |  | (189 | ) |  |  | — |  |  |  | 891 |  |  |  | 1,071 |  |  |  | (181 | ) |  |  | — |  |  |  | 890 |
Concession contract assets (1) (2) |  |  | 172 |  |  |  | 189 |  |  |  | 215 |  |  |  | 576 |  |  |  | 131 |  |  |  | 181 |  |  |  | 170 |  |  |  | 482 |
Others |  |  | 8,887 |  |  |  | — |  |  |  | — |  |  |  | 8,887 |  |  |  | 26,594 |  |  |  | — |  |  |  | — |  |  |  | 26,594 |
Total current assets |  |  | 10,139 |  |  |  | — |  |  |  | 215 |  |  |  | 10,354 |  |  |  | 27,796 |  |  |  | — |  |  |  | 170 |  |  |  | 27,966 |
NON-CURRENT ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concession financial assets (1) |  |  | 4,851 |  |  |  | (1,092 | ) |  |  | — |  |  |  | 3,759 |  |  |  | 4,927 |  |  |  | (1,115 | ) |  |  | — |  |  |  | 3,812 |
Concession contract assets - transmission (1) (2) |  |  | 1,024 |  |  |  | 1,092 |  |  |  | 383 |  |  |  | 2,499 |  |  |  | 999 |  |  |  | 1,115 |  |  |  | 313 |  |  |  | 2,427 |
Others |  |  | 33,914 |  |  |  | — |  |  |  | — |  |  |  | 33,914 |  |  |  | 26,134 |  |  |  | — |  |  |  | — |  |  |  | 26,134 |
Total non-current assets |  |  | 39,789 |  |  |  | — |  |  |  | 383 |  |  |  | 40,172 |  |  |  | 32,060 |  |  |  | — |  |  |  | 313 |  |  |  | 32,373 |
TOTAL ASSETS |  |  | 49,928 |  |  |  | — |  |  |  | 598 |  |  |  | 50,526 |  |  |  | 59,856 |  |  |  | — |  |  |  | 483 |  |  |  | 60,339 |
|  | December 31, 2019 |  |  | January 01,2019 |
Statement of financial position |  | As presented |  |  | Adjustment |  |  | Restated |  |  | As presented |  |  | Adjustment |  |  | Restated |
CURRENT LIABILITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxes payable (3) |  |  | 359 |  |  |  | 52 |  |  |  | 411 |  |  |  | 409 |  |  |  | 44 |  |  |  | 453 |
Others |  |  | 7,554 |  |  |  | — |  |  |  | 7,554 |  |  |  | 22,984 |  |  |  | — |  |  |  | 22,984 |
Total current liabilities |  |  | 7,913 |  |  |  | 52 |  |  |  | 7,965 |  |  |  | 23,393 |  |  |  | 44 |  |  |  | 23,437 |
NON-CURRENT LIABILITIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxes payable (3) |  |  | 1 |  |  |  | 226 |  |  |  | 227 |  |  |  | 30 |  |  |  | 219 |  |  |  | 249 |
Deferred income tax and social contribution tax (4) |  |  | 661 |  |  |  | 109 |  |  |  | 770 |  |  |  | 728 |  |  |  | 75 |  |  |  | 803 |
Others |  |  | 25,461 |  |  |  | — |  |  |  | 25,461 |  |  |  | 19,766 |  |  |  | — |  |  |  | 19,766 |
Total non-current liabilities |  |  | 26,123 |  |  |  | 335 |  |  |  | 26,458 |  |  |  | 20,524 |  |  |  | 294 |  |  |  | 20,818 |
TOTAL LIABILITIES |  |  | 34,036 |  |  |  | 387 |  |  |  | 34,423 |  |  |  | 43,917 |  |  |  | 338 |  |  |  | 44,255 |
EQUITY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | — |  |  |  | 212 |  |  |  | 212 |  |  |  | — |  |  |  | 145 |  |  |  | 145 |
Others |  |  | 15,887 |  |  |  | — |  |  |  | 15,887 |  |  |  | 14,579 |  |  |  | — |  |  |  | 14,579 |
EQUITY ATTRIBUTABLE TO EQUITY HOLDERS OF THE PARENT (5) |  |  | 15,887 |  |  |  | 212 |  |  |  | 16,099 |  |  |  | 14,579 |  |  |  | 145 |  |  |  | 14,724 |
NON-CONTROLLING INTERESTS |  |  | 4 |  |  |  | — |  |  |  | 4 |  |  |  | 1,360 |  |  |  | — |  |  |  | 1,360 |
TOTAL EQUITY |  |  | 15,891 |  |  |  | 212 |  |  |  | 16,103 |  |  |  | 15,939 |  |  |  | 145 |  |  |  | 16,084 |
| (1) | Reclassification of the financial portion of the Basic Network of the Existing System (‘BNES’) asset to contract asset, since it was included into the remuneration base, and, thus, it is subject to the efficiency mechanisms applied to the operation and maintenance performance obligation.
| (2) | Recognition of the profit margin associated to the performance obligation to construct and upgrade the transmission infrastructure, as well as the interest revenue resulting from the financing component in the contract asset and the result of the periodic tariff revision;
| (3) | Effects of PIS/Pasep and Cofins over contract revenues.
| (4) | Deferral of income tax and social contribution tax over the adjustments;
| (5) | Effects of retrospective application of accounting policy, recorded as retained earnings, in accordance with IAS 08.
Statement of income |
STATEMENT OF INCOME |  | Dec 31, 2019 |  | Dec 31, 2018
As presented |  | Adjustment |  | Restated |  | As presented |  | Adjustment |  | Restated
CONTINUING OPERATIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NET REVENUE (1) |  |  | 25,390 |  |  |  | 96 |  |  |  | 25,486 |  |  |  | 22,266 |  |  |  | 33 |  |  |  | 22,299 |
TOTAL COST |  |  | (19,598 | ) |  |  | — |  |  |  | (19,598 | ) |  |  | (17,677 | ) |  |  | — |  |  |  | (17,677 | )
GROSS PROFIT |  |  | 5,792 |  |  |  | 96 |  |  |  | 5,888 |  |  |  | 4,589 |  |  |  | 33 |  |  |  | 4,622 |
OPERATING EXPENSES (2) |  |  | (2,881 | ) |  |  | 5 |  |  |  | (2,876 | ) |  |  | (1,743 | ) |  |  | — |  |  |  | (1,743 | )
Share of profit (loss), net, of affiliates and jointly-controlled entities |  |  | 125 |  |  |  | — |  |  |  | 125 |  |  |  | (104 | ) |  |  | — |  |  |  | (104 | )
Dividends declared by investee classified as held for sale |  |  | 73 |  |  |  | — |  |  |  | 73 |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement of previously held equity interest in subsidiaries acquired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (119 | ) |  |  | — |  |  |  | (119 | )
Impairment loss on investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (127 | ) |  |  | — |  |  |  | (127 | )
Net finance income |  |  | 1,360 |  |  |  | — |  |  |  | 1,360 |  |  |  | (518 | ) |  |  | — |  |  |  | (518 | )
Income before income tax and social contribution tax |  |  | 4,469 |  |  |  | 101 |  |  |  | 4,570 |  |  |  | 1,978 |  |  |  | 33 |  |  |  | 2,011 |
Current income tax and social contribution tax |  |  | (1,454 | ) |  |  | — |  |  |  | (1,454 | ) |  |  | (583 | ) |  |  | — |  |  |  | (583 | )
Deferred income tax and social contribution tax (3) |  |  | (111 | ) |  |  | (34 | ) |  |  | (145 | ) |  |  | (16 | ) |  |  | (11 | ) |  |  | (27 | )
Net income for the year from continuing operations |  |  | 2,904 |  |  |  | 67 |  |  |  | 2,971 |  |  |  | 1,379 |  |  |  | 22 |  |  |  | 1,401 |
DISCONTINUED OPERATIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income after tax for the year from discontinued operations |  |  | 224 |  |  |  | — |  |  |  | 224 |  |  |  | 363 |  |  |  | — |  |  |  | 363 |
NET INCOME FOR THE YEAR |  |  | 3,128 |  |  |  | 67 |  |  |  | 3,195 |  |  |  | 1,742 |  |  |  | 22 |  |  |  | 1,764 |
Total of net income for the year attributed to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity holders of the parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  | 2,903 |  |  |  | 67 |  |  |  | 2,970 |  |  |  | 1,378 |  |  |  | 22 |  |  |  | 1,400 |
Net income from discontinued operations |  |  | 224 |  |  |  | — |  |  |  | 224 |  |  |  | 322 |  |  |  | — |  |  |  | 322 |
Net income for the year attributed to equity holders of the parent |  |  | 3,127 |  |  |  | 67 |  |  |  | 3,194 |  |  |  | 1,700 |  |  |  | 22 |  |  |  | 1,722 |
Non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | 1 |
Net income from discontinued operations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 41 |  |  |  | — |  |  |  | 41 |
NET INCOME FOR THE YEAR |  |  | 3,128 |  |  |  | 67 |  |  |  | 3,195 |  |  |  | 1,742 |  |  |  | 22 |  |  |  | 1,764 |
Basic and diluted earnings per preferred share – R$ (4) |  |  | 2.06 |  |  |  | 0.17 |  |  |  | 1.89 |  |  |  | 1.17 |  |  |  | (0.15 | ) |  |  | 1.02 |
Basic and diluted earnings per common share – R$ (4) |  |  | 2.06 |  |  |  | 0.17 |  |  |  | 1.89 |  |  |  | 1.17 |  |  |  | (0.15 | ) |  |  | 1.02 |
Basic and diluted earnings per preferred share from continuing operations – R$ (4) |  |  | 1.91 |  |  |  | 0.14 |  |  |  | 1.75 |  |  |  | 0.95 |  |  |  | (0.12 | ) |  |  | 0.83 |
Basic and diluted earnings per common share from continuing operations – R$ (4) |  |  | 1.91 |  |  |  | 0.14 |  |  |  | 1.75 |  |  |  | 0.95 |  |  |  | (0.12 | ) |  |  | 0.83 |
Basic and diluted earnings per preferred share from discontinued operations – R$ (4) |  |  | 0.15 |  |  |  | 0.01 |  |  |  | 0.14 |  |  |  | 0.22 |  |  |  | (0.03 | ) |  |  | 0.19 |
Basic and diluted earnings per common share from discontinued operations – R$ (4) |  |  | 0.15 |  |  |  | 0.01 |  |  |  | 0.14 |  |  |  | 0.22 |  |  |  | (0.03 | ) |  |  | 0.19 |
| (1) | Recognition of the profit margin associated to the performance obligation to construct and upgrade the transmission infrastructure, as well as the interest revenue resulting from the financing component;
| (2) | Reversal of expected losses recorded in others expenses in prior periods.;
| (3) | Deferral of income tax and social contribution tax over the adjustments;
| (4) | The basic and diluted earnings per share for the years ended in December 31, 2019 and 2018 were also adjusted retrospectively in order to reflect the increase in the number of shares in 2021. For more information, see Note 26.
Statement of cash flows |
STATEMENT OF CASH FLOWS |  | Dec 31, 2019 As presented |  | Adjustment |  | Dec 31, 2018 Restated
CASH FLOW FROM OPERATIONS |  |  |  |  |  |  |  |  |  |  |  |
Net income for the year from continuing operations |  |  | 2,904 |  |  |  | 67 |  |  |  | 2,971 |
Net income for the year from discontinuing operations |  |  | 224 |  |  |  | — |  |  |  | 224 |
Adjustments to reconcile net income to net cash flows: |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax and social contribution tax (2) |  |  | 111 |  |  |  | 34 |  |  |  | 145 |
Loss on write-off of net residual value of unrecoverable concession financial assets, concessional contract asset, PP&E and Intangible assets (3) |  |  | 130 |  |  |  | (5 | ) |  |  | 125 |
Adjustment to expectation of contract asset and financial concession asset (4) |  |  | (507 | ) |  |  | (249 | ) |  |  | (756 | )
Deffered PIS/Pasep and Cofins over contract revenues (6) |  |  | — |  |  |  | 15 |  |  |  | 15 |
Others |  |  | 1,072 |  |  |  | — |  |  |  | 1,072 |
TOTAL |  |  | 3,934 |  |  |  | (138 | ) |  |  | 3,796 |
(Increase) decrease in assets |  |  |  |  |  |  |  |  |  |  |  |
Concession contract and financial assets (5) |  |  | 373 |  |  |  | 138 |  |  |  | 511 |
Others |  |  | (67 | ) |  |  | — |  |  |  | (67 | )
TOTAL |  |  | 306 |  |  |  | 138 |  |  |  | 444 |
Increase (decrease) in liabilities |  |  | 957 |  |  |  | — |  |  |  | 957 |
Cash generated by operating activities |  |  | 5,197 |  |  |  | — |  |  |  | 5,197 |
| (1) | Effects of retrospective application of accounting policy, recorded as retained earnings, in accordance with IAS 08.
| (2) | Deferral of income tax and social contribution tax over the adjustments;
| (3) | Others immaterial adjustments referring to impairment losses and others expected losses.
| (4) | Recognition of the profit margin associated to the performance obligation to construct and upgrade the transmission infrastructure, as well as the interest revenue resulting from the financing component and the result of the periodic tariff revision;
| (5) | Adjustments in the amounts of the contract assets that were received, due to the reallocation of the consideration to performance obligation to construct and upgrade.
| (6) | Effects of PIS/Pasep and Cofins over contract revenues, including the deferred taxes;
STATEMENT OF CASH FLOWS |  | Dec 31, 2019 As presented |  | Adjustment |  | Dec 31, 2018 Restated
CASH FLOW FROM OPERATIONS |  |  |  |  |  |  |  |  |  |  |  |
Net income for the year from continuing operations |  |  | 1.379 |  |  |  | 22 |  |  |  | 1.401 |
Net income for the year from discontinuing operations |  |  | 363 |  |  |  | — |  |  |  | 363 |
Adjustments to reconcile net income to net cash flows: |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax and social contribution tax (2) |  |  | 16 |  |  |  | 11 |  |  |  | 27 |
Adjustment to expectation of contract asset and financial concession asset (3) |  |  | (585 | ) |  |  | (92 | ) |  |  | (677 | )
Others (4) |  |  | 985 |  |  |  | 2 |  |  |  | 987 |
TOTAL |  |  | 2,158 |  |  |  | (57 | ) |  |  | 2,101 |
(Increase) / decrease in assets |  |  |  |  |  |  |  |  |  |  |  |
Concession contract and financial assets (5) |  |  | 1,704 |  |  |  | 57 |  |  |  | 1,761 |
Others |  |  | 1,450 |  |  |  | — |  |  |  | 1,450 |
TOTAL |  |  | 3,154 |  |  |  | 57 |  |  |  | 3,211 |
Increase (decrease) in liabilities |  |  | (2,023 | ) |  |  | — |  |  |  | (2,023 | )
TOTAL |  |  | 3,289 |  |  |  | — |  |  |  | 3,289 |
| (1) | Effects of retrospective application of accounting policy, recorded as retained earnings, in accordance with IAS 08.
| (2) | Deferral of income tax and social contribution tax over the adjustments;
| (3) | Recognition of the profit margin associated to the performance obligation to construct and upgrade the transmission infrastructure, as well as the interest revenue resulting from the financing component) and the result of the periodic tariff revision;
| (4) | Adjustments in the amounts of the contract assets that were received, due to the reallocation of the consideration to performance obligation to construct and upgrade;
| (5) | Effects of PIS/Pasep and Cofins over contract revenues, including the deferred taxes.
Statement of comprehensive income |
Statement of comprehensive income |  | Dec 31, 2019 As presented |  | Adjustment |  | Dec 31, 2019 Restated |  | Dec 31, 2018 As presented |  | Adjustment |  | Dec 31, 2018 Restated
NET INCOME FOR THE YEAR |  |  | 3,128 |  |  |  | 67 |  |  |  | 3,195 |  |  |  | 1,742 |  |  |  | 22 |  |  |  | 1,764 |
OTHER COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Items not to be reclassified to profit or loss in subsequent periods |  |  | (1,055 | ) |  |  | — |  |  |  | (1,055 | ) |  |  | (463 | ) |  |  | — |  |  |  | (463 | )
COMPREHENSIVE INCOME FOR THE YEAR |  |  | 2,073 |  |  |  | 67 |  |  |  | 2,140 |  |  |  | 1,279 |  |  |  | 22 |  |  |  | 1,301 |
Total of comprehensive income for the year attributed to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity holders of the parent |  |  | 2,072 |  |  |  | 67 |  |  |  | 2,139 |  |  |  | 1,237 |  |  |  | 22 |  |  |  | 1,259 |
Non-controlling interests |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | 42 |  |  |  | — |  |  |  | 42 |
|  |  | 2,073 |  |  |  | 67 |  |  |  | 2,140 |  |  |  | 1,279 |  |  |  | 22 |  |  |  | 1,301 |

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