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27. REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue [abstract] |
Schedule of net operating revenue | Revenues are measured at the fair value of the consideration received or to be received and are recognized on a monthly basis as and when: (i) Rights and obligations of the contract with the customer are identified; (ii) the performance obligation of the contract is identified; (iii) the price for each transaction has been determined; (iv) the transaction price has been allocated to the performance obligations defined in the contract; and (v) the performance obligations have been complied.
|  | 2020 |  | 2019 (Restated) |  | 2018 (Restated)
Revenue from supply of energy (a) |  |  | 26,432 |  |  |  | 26,928 |  |  |  | 24,872 |
Revenue from use of the electricity distribution systems (TUSD) (b) |  |  | 3,022 |  |  |  | 2,722 |  |  |  | 2,045 |
CVA, and Other financial components (c) |  |  | 455 |  |  |  | 58 |  |  |  | 1,973 |
Reimbursement of PIS/Pasep and Cofins over ICMS credits to customers– realization (1) |  |  | 266 |  |  |  | — |  |  |  | — |
Transmission revenue |  |  |  |  |  |  |  |  |  |  |  |
Transmission operation and maintenance revenue (d) |  |  | 280 |  |  |  | 352 |  |  |  | 343 |
Transmission construction revenue (d) (note 14) |  |  | 201 |  |  |  | 312 |  |  |  | 138 |
Interest revenue arising from the financing component in the transmission contract asset (d) (note 14) |  |  | 438 |  |  |  | 328 |  |  |  | 311 |
Generation assets - indemnity revenue |  |  | — |  |  |  | — |  |  |  | 55 |
Distribution construction revenue (e) |  |  | 1,436 |  |  |  | 980 |  |  |  | 802 |
Adjustment to expectation of cash flow from indemnifiable financial assets of distribution concession (g) |  |  | 16 |  |  |  | 18 |  |  |  | — |
Revenue on financial updating of the Concession Grant Fee (h) |  |  | 347 |  |  |  | 318 |  |  |  | 321 |
Energy transactions on the CCEE (i) |  |  | 154 |  |  |  | 432 |  |  |  | 217 |
Mechanism for the sale of surplus (h) |  |  | 234 |  |  |  | — |  |  |  | — |
Supply of gas |  |  | 2,011 |  |  |  | 2,298 |  |  |  | 1,995 |
Fine for violation of service continuity indicator |  |  | (51 | ) |  |  | (58 | ) |  |  | (44 | )
Recovery of PIS/Pasep and Cofins (note 9) |  |  | — |  |  |  | 1,428 |  |  |  | — |
Other operating revenues (j) |  |  | 1,709 |  |  |  | 1,721 |  |  |  | 1,585 |
Deductions on revenue (k) |  |  | (11,722 | ) |  |  | (12,351 | ) |  |  | (12,314 | )
Net revenue |  |  | 25,228 |  |  |  | 25,486 |  |  |  | 22,299 |
(1) | For more information, see note 9 from this financial statements.
Schedule of the supply of electricity by type of consumer | This table shows energy supply by type of customer:
|  | GWh (1) |  | R$
|  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Residential |  |  | 10,981 |  |  |  | 10,538 |  |  |  | 10,267 |  |  |  | 9,875 |  |  |  | 9,668 |  |  |  | 8,658 |
Industrial |  |  | 12,731 |  |  |  | 14,873 |  |  |  | 17,689 |  |  |  | 4,171 |  |  |  | 4,760 |  |  |  | 4,893 |
Commercial, services and others |  |  | 8,571 |  |  |  | 9,335 |  |  |  | 8,380 |  |  |  | 4,979 |  |  |  | 5,439 |  |  |  | 4,683 |
Rural |  |  | 3,766 |  |  |  | 3,795 |  |  |  | 3,615 |  |  |  | 2,190 |  |  |  | 2,058 |  |  |  | 1,794 |
Public authorities |  |  | 714 |  |  |  | 905 |  |  |  | 871 |  |  |  | 522 |  |  |  | 654 |  |  |  | 575 |
Public lighting |  |  | 1,243 |  |  |  | 1,357 |  |  |  | 1,384 |  |  |  | 550 |  |  |  | 614 |  |  |  | 585 |
Public services |  |  | 1,362 |  |  |  | 1,373 |  |  |  | 1,316 |  |  |  | 722 |  |  |  | 725 |  |  |  | 646 |
Subtotal |  |  | 39,368 |  |  |  | 42,176 |  |  |  | 43,522 |  |  |  | 23,009 |  |  |  | 23,918 |  |  |  | 21,834 |
Own consumption |  |  | 34 |  |  |  | 38 |  |  |  | 41 |  |  |  | — |  |  |  | — |  |  |  | — |
Unbilled revenue |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9 |  |  |  | 134 |  |  |  | 48 |
|  |  | 39,402 |  |  |  | 42,214 |  |  |  | 43,563 |  |  |  | 23,018 |  |  |  | 24,052 |  |  |  | 21,882 |
Wholesale supply to other concession holders (2) |  |  | 13,907 |  |  |  | 11,920 |  |  |  | 11,992 |  |  |  | 3,363 |  |  |  | 2,943 |  |  |  | 3,002 |
Wholesale supply unbilled, net |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 51 |  |  |  | (67 | ) |  |  | (12 | )
Total |  |  | 53,309 |  |  |  | 54,134 |  |  |  | 55,555 |  |  |  | 26,432 |  |  |  | 26,928 |  |  |  | 24,872 |
| (1) | Data not audited by external auditors.
| (2) | Includes a CCEAR (Regulated Market Sales Contract), ‘bilateral contracts’ with other agents, and the revenues from management of generation assets (GAG) for the 18 hydroelectric plants of Lot D of Auction no 12/2015.
Schedule of revenue use distribution system | The total amount of energy transported, in MWh, is as follows:
|  | GWh (1)
|  | 2020 |  | 2019
| Industrial |  |  |  | 18,612 |  |  |  | 17,723 |
| Commercial |  |  |  | 1,300 |  |  |  | 1,320 |
| Rural |  |  |  | 32 |  |  |  | 17 |
| Concessionaires |  |  |  | 315 |  |  |  | 341 |
| Total |  |  |  | 20,259 |  |  |  | 19,401 |
| (1) | Data not reviewed by external auditors
Schedule of transmission concession contract | The margin defined for each performance obligation from the transmission concession contract is as follows:
|  | 2020 |  | 2019 |  | 2018
Construction and upgrades revenue |  |  | 201 |  |  |  | 312 |  |  |  | 138 |
Construction and upgrades costs |  |  | (147 | ) |  |  | (220 | ) |  |  | (96 | )
Margin |  |  | 54 |  |  |  | 92 |  |  |  | 42 |
Mark-up (%) |  |  | 36.73 | % |  |  | 41.82 | % |  |  | 43.75 | %
Operation and maintenance revenue |  |  | 279 |  |  |  | 352 |  |  |  | 343 |
Operation and maintenance cost |  |  | (223 | ) |  |  | (388 | ) |  |  | (215 | )
Margin |  |  | 56 |  |  |  | (36 | ) |  |  | 128 |
Mark-up (%) |  |  | 25,11 | % |  |  | (9.28 | %) |  |  | 59.53 | %
| (1) | The negative margin observed in 2019 related to the performance obligation to operate and maintain is due the recognition of the non-recurring tax provision, in the amount of R$135.
Schedule of other operating revenues |
j) | Other operating revenues
|  | 2020 |  | 2019 |  | 2018
Charged service |  |  | 11 |  |  |  | 17 |  |  |  | 14 |
Services rendered |  |  | 139 |  |  |  | 183 |  |  |  | 188 |
Subsidies (1) |  |  | 1,395 |  |  |  | 1,266 |  |  |  | 1,136 |
Rental and leasing |  |  | 164 |  |  |  | 189 |  |  |  | 90 |
Reimbursement for decontracted supply (2) |  |  | — |  |  |  | 65 |  |  |  | 145 |
Other |  |  | — |  |  |  | 1 |  |  |  | 12 |
|  |  | 1,709 |  |  |  | 1,721 |  |  |  | 1,585 |
(1) | Includes the revenue recognized for the tariff subsidies applied to users of the distribution system, in accordance with the Decree n.7,891/2013, in the amount of R$1,035 in 2020 (R$1,079 in 2019). Includes the subsidies for sources that are subject to incentive, rural, irrigators, public services and the generation sources that are subject to the incentive; and also includes the tariff flag revenue in the amount of R$47 in 2020, recognized because of the creditor position assumed by the Company in CCRBT.
(2) | Reimbursement for suspension of energy supply –Renova.
Schedule of deductions from revenue |
k) | Deductions on revenue
|  | 2020 |  | 2019 (Restated) |  | 2018 (Restated)
Taxes on revenue |  |  |  |  |  |  |  |  |  |  |  |
ICMS |  |  | 6,098 |  |  |  | 6,358 |  |  |  | 5,657 |
Cofins |  |  | 2,214 |  |  |  | 2,408 |  |  |  | 2,549 |
PIS/Pasep |  |  | 481 |  |  |  | 524 |  |  |  | 553 |
Others |  |  | 5 |  |  |  | 7 |  |  |  | 8 |
|  |  | 8,798 |  |  |  | 9,297 |  |  |  | 8,767 |
Charges to the customer |  |  |  |  |  |  |  |  |  |  |  |
Global Reversion Reserve (RGR) |  |  | 16 |  |  |  | 16 |  |  |  | 19 |
Energy Efficiency Program (PEE) |  |  | 73 |  |  |  | 69 |  |  |  | 64 |
Energy Development Account (CDE) |  |  | 2,443 |  |  |  | 2,448 |  |  |  | 2,603 |
Research and Development (R&D) |  |  | 43 |  |  |  | 41 |  |  |  | 38 |
National Scientific and Technological Development Fund (FNDCT) |  |  | 43 |  |  |  | 41 |  |  |  | 38 |
Energy System Expansion Research (EPE of MME) |  |  | 21 |  |  |  | 20 |  |  |  | 19 |
Customer charges – Proinfa alternative sources program |  |  | 39 |  |  |  | 52 |  |  |  | 40 |
Energy services inspection fee |  |  | 35 |  |  |  | 30 |  |  |  | 26 |
Royalties for use of water resources |  |  | 62 |  |  |  | 43 |  |  |  | 45 |
Customer charges – the ‘Flag Tariff’ system |  |  | 149 |  |  |  | 294 |  |  |  | 655 |
|  |  | 2,924 |  |  |  | 3,054 |  |  |  | 3,547 |
|  |  | 11,722 |  |  |  | 12,351 |  |  |  | 12,314 |

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