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31 Net Operating Revenue (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | R$ 25,227,782 | R$ 23,725,810 | R$ 21,574,289
PIS/Pasep and Cofins | (2,161,120) | (2,117,800) | (1,788,714)
Recovery of Pis/Pasep and Cofins on ICMS | (105,184) |  |
ICMS (VAT) | (4,656,686) | (4,210,382) | (3,734,940)
Sectorial charges | (2,161,811) | 2,457,562 | (2,020,674)
Service tax (ISSQN) | (3,891) | (5,286) | (5,388)
Net operating revenues | 16,244,274 | 14,934,780 | 14,024,573
Electricity Sales To Final Customers [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 10,481,794 | 10,104,045 | 8,689,516
PIS/Pasep and Cofins | (965,651) |  |
ICMS (VAT) | (2,336,583) |  |
Sectorial charges | (753,544) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 6,426,016 | 5,548,584 | 4,681,533
Electricity Sales To Final Customers [Member] | Residential [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 3,336,432 | 3,175,290 | 2,750,514
Electricity Sales To Final Customers [Member] | Industrial [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,276,105 | 1,419,240 | 1,337,893
Electricity Sales To Final Customers [Member] | Trade, Services and Other Activities [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 2,179,510 | 2,136,087 | 1,880,862
Electricity Sales To Final Customers [Member] | Rural [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 631,527 | 572,361 | 511,196
Electricity Sales To Final Customers [Member] | Public Entities [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 279,495 | 262,705 | 236,719
Electricity Sales To Final Customers [Member] | Public Lighting [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 274,250 | 278,645 | 244,381
Electricity Sales To Final Customers [Member] | Public Service [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 332,414 | 316,307 | 275,431
Electricity Sales To Final Customers [Member] | Free Consumers [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues |  | 1,179,314 | 845,964
Electricity Sales To Final Customers [Member] | Donations and Grants [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 740,787 | 764,096 | 606,556
Electricity Sales To Final Customers [Member] | Free Consumers [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,431,274 |  |
Electricity Sales To Distributors [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 3,301,336 | 3,136,244 | 3,529,770
PIS/Pasep and Cofins | (368,101) |  |
ICMS (VAT) | (10,727) |  |
Sectorial charges | (56,642) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 2,865,866 | 3,136,244 | 3,176,354
Electricity Sales To Distributors [Member] | Bilateral Contracts [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,998,617 | 2,002,077 | 1,947,862
Electricity Sales To Distributors [Member] | Regulated contracts [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 854,239 | 385,157 | 421,805
Electricity Sales To Distributors [Member] | Electric Energy Trade Chamber CCEE [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 357,076 | 663,024 |
Electricity Sales To Distributors [Member] | Interest [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 91,404 | 85,986 | 82,160
Electricity Sales To Distributors [Member] | Concessionaires And Generators [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 62,414 |  |
Electricity Sales To Distributors [Member] | Electric Energy Trade Chamber - CCEE [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 357,076 |  | 1,077,943
Use Of The Main Distribution and Transmission Grid [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 8,270,996 | 3,469,060 | 6,442,761
PIS/Pasep and Cofins | (781,017) |  |
ICMS (VAT) | (1,999,583) |  |
Sectorial charges | (1,351,625) |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 4,138,771 |  | 3,617,941
Use Of The Main Distribution and Transmission Grid [Member] | Residential [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 2,585,892 | 2,222,621 | 2,025,400
Use Of The Main Distribution and Transmission Grid [Member] | Industrial [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,280,168 | 1,110,089 | 1,024,452
Use Of The Main Distribution and Transmission Grid [Member] | Trade, Services and Other Activities [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,713,632 | 1,407,156 | 1,304,285
Use Of The Main Distribution and Transmission Grid [Member] | Rural [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 467,044 |  | 341,875
Use Of The Main Distribution and Transmission Grid [Member] | Public Entities [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 206,492 | 185,383 | 174,427
Use Of The Main Distribution and Transmission Grid [Member] | Public Lighting [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 206,492 | 184,530 | 167,907
Use Of The Main Distribution and Transmission Grid [Member] | Public Service [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 174,414 | 141,556 | 126,795
Use Of The Main Distribution and Transmission Grid [Member] | Free Consumers [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,052,535 | 795,105 | 663,248
Use Of The Main Distribution and Transmission Grid [Member] | Concessionaires And Generators [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues |  | 80,329 | 60,485
Use Of The Main Distribution and Transmission Grid [Member] | Interest Income [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues |  | 58,578 |
Use Of The Main Distribution and Transmission Grid [Member] | Operating and Maintenance Income - O&M [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 98,207 |  | 113,324
Use Of The Main Distribution and Transmission Grid [Member] | Interest Income [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 413,171 |  | 440,563
Construction Income [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,132,884 | 1,097,313 | 868,001
PIS/Pasep and Cofins |  |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 1,132,884 | 1,097,313 | 868,001
Fair Value Of Assets From The Indemnity For The Concession [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 36,646 | 47,499 | 57,080
PIS/Pasep and Cofins |  |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 36,646 | 47,499 | 57,080
Telecommunications [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 532,926 | 512,540 | 426,773
PIS/Pasep and Cofins | (21,035) |  |
ICMS (VAT) | (137,896) |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (558) |  |
Net operating revenues | 373,437 | 512,540 | 308,952
Distribution Of Piped Gas [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,003,790 | 753,222 | 621,992
PIS/Pasep and Cofins | 11,313 |  |
ICMS (VAT) | (171,897) |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (23) |  |
Net operating revenues | 843,183 | 557,186 | 454,815
Sectorial Financial Assets and Liabilities Result [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 25,057 | 985,344 | 767,040
PIS/Pasep and Cofins | (6,426) |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) |  |  |
Net operating revenues | 18,631 | 893,688 | 718,826
Other Operating Revenue [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 442,353 | 222,329 | 171,356
PIS/Pasep and Cofins | (30,203) |  |
ICMS (VAT) |  |  |
Sectorial charges |  |  |
Service tax (ISSQN) | (3,310) |  |
Net operating revenues | 408,840 | 189,355 | 141,071
Other Operating Revenue [Member] | Other Income [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 22,146 | 11,892 | 15,898
Other Operating Revenue [Member] | Charged Service [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 18,807 | 18,475 | 15,981
Other Operating Revenue [Member] | Income From Rendering Of Services [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 51,780 | 59,280 | 30,247
Other Operating Revenue [Member] | Leasing And Rent [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 144,744 | 132,682 | 109,230
Distribution Of Piped Gas [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | 1,003,790 |  |
Fair Value In The Purchase and Sale Of Power In The Active Market [Member] |  |  |
Disclosure of net operating revenue [line items] |  |  |
Gross operating revenues | R$ 204,876 |  |

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