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18 Intangible Assets (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | R$ 6,029,097 |  |  |  |  |
Effect of acquisition of control of Costa Oeste and Marumbi |  |  |  | R$ 66,775 |  |  |
Loss on disposal |  | 26,789 |  | 28,742 |  | R$ 42,740 |
Intangible assets, ending |  | 6,332,611 |  | 6,029,097 |  |  |
Distribution Concession Agreement in Service [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 8,212,792 |  | 7,907,965 |  |  |
Acquisitions |  |  |  |  |  |  |
Incorporations |  | 2,625 |  |  |  |  |
Amortization of quotas - concession and authorization | [1] | (461,370) |  | (431,963) |  |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  | (10,740) |  | (10,813) |  |  |
Loss on disposal |  | (26,359) |  | (28,098) |  |  |
Provision for claims added to the cost of the works |  |  |  |  |  |  |
Transfers to other receivables |  | (1,520) |  |  |  |  |
Transfers to investments |  | (7) |  |  |  |  |
Transfers to contract assets |  |  |  |  |  |  |
Transfers from contract assets |  | 771,844 |  | 775,701 |  |  |
Intangible assets, ending |  | 8,487,265 |  | 8,212,792 |  | 7,907,965 |
Distribution Concession Agreement Special Liabilities in Service [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | (2,822,729) |  | (2,845,438) |  |  |
Incorporations |  | (2,550) |  |  |  |  |
Amortization of quotas - concession and authorization | [1] | (134,864) |  | 130,388 |  |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  |  |  |  |  |  |
Loss on disposal |  |  |  |  |  |  |
Transfers to contract assets |  |  |  |  |  |  |
Transfers from contract assets |  | (93,164) |  | (107,679) |  |  |
Intangible assets, ending |  | (2,783,579) |  | (2,822,729) |  | (2,845,438) |
Distribution Concession Agreement in Progress [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  |  |  | 714,446 |  |  |
Capitalizations for intangible in service |  |  |  |  |  |  |
Amortization of quotas - concession and authorization |  |  |  |  |  |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  |  |  |  |  |  |
Loss on disposal |  |  |  |  |  |  |
Customers contributions |  |  |  |  |  |  |
Transfers to contract assets |  |  |  | (714,446) |  |  |
Transfers from contract assets |  |  |  |  |  |  |
Intangible assets, ending |  |  |  |  |  | 714,446 |
Distribution Concession Agreement Special Liabilities in Progress [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  |  |  | (26,100) |  |  |
Capitalizations for intangible in service |  |  |  |  |  |  |
Amortization of quotas - concession and authorization |  |  |  |  |  |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  |  |  |  |  |  |
Loss on disposal |  |  |  |  |  |  |
Customers contributions |  |  |  |  |  |  |
Transfers to contract assets |  |  |  | (26,100) |  |  |
Transfers from contract assets |  |  |  |  |  |  |
Intangible assets, ending |  |  |  |  |  | (26,100) |
Distribution Concession Agreement [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 5,390,063 |  | 5,750,873 |  |  |
Incorporations |  | 75 |  |  |  |  |
Capitalizations for intangible in service |  |  |  |  |  |  |
Amortization of quotas - concession and authorization | [1] | (326,506) |  | (301,575) |  |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  | (10,740) |  | (10,813) |  |  |
Loss on disposal |  | (26,359) |  | (28,098) |  |  |
Transfers to other receivables |  | (1,520) |  |  |  |  |
Transfers to investments |  | (7) |  |  |  |  |
Transfers to contract assets |  |  |  | (688,346) |  |  |
Transfers from contract assets |  | 678,680 |  | 668,022 |  |  |
Intangible assets, ending |  | 5,703,686 |  | 5,390,063 |  | 5,750,873 |
Generation Concession Agreement in Service [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 226,411 |  | 236,443 |  |  |
Capitalizations for intangible in service |  |  |  | 7,279 |  |  |
Amortization of quotas - concession and authorization | [2] | (16,944) |  | (17,311) |  |  |
ANEEL grant - use of public property |  |  |  |  |  |  |
Business combination (Note 1.2) |  |  |  |  |  |  |
Intangible assets, ending |  | 209,467 |  | 226,411 |  | 236,443 |
Generation Concession Agreement in Progress [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  |  |  | 6,977 | [3] |  |
Amortization of quotas - concession and authorization |  |  | [3] |  |  |  |
ANEEL grant - use of public property | [3] |  |  |  |  |  |
Business combination (Note 1.2) |  |  |  |  |  |  |
Intangible assets, ending |  |  | [3] |  |  | 6,977 | [3]
Generation Concession Agreement Concession Authorization Rights [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 367,441 |  | 375,801 |  |  |
Amortization of quotas - concession and authorization | [2] | (31,294) |  | (13,205) |  |  |
ANEEL grant - use of public property |  |  |  |  |  |  |
Business combination (Note 1.2) |  | 20,113 |  | 4,845 |  |  |
Intangible assets, ending |  | 582,671 |  | 367,441 |  | 375,801 |
Generation Concession Agreement [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 593,852 |  | 619,221 |  |  |
Amortization of quotas - concession and authorization | [2] | (14,350) |  | (30,516) |  |  |
ANEEL grant - use of public property |  |  |  | 302 |  |  |
Business combination (Note 1.2) |  | 20,113 |  | 4,845 |  |  |
Intangible assets, ending |  | 582,671 |  | 593,852 |  | 619,221 |
Gas Distribution in Service [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 3,619 |  | 24,417 |  |  |
Acquisitions |  |  |  |  |  |  |
Transfers from property, plant and equipment |  | 24,835 |  |  |  |  |
Capitalizations for intangible in service |  | 10,011 |  | 2,042 | [1] |  |
Amortization of quotas - concession and authorization |  | (28,454) | [1] | (22,759) |  |  |
Loss on disposal |  |  |  | (81) |  |  |
Transfers to contract assets |  |  |  |  |  |  |
Intangible assets, ending |  |  |  | 3,619 |  | 24,417 |
Gas Distribution in Progress [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  |  |  | 19,471 |  |  |
Acquisitions |  |  |  |  |  |  |
Capitalizations for intangible in service |  |  |  |  | [1] |  |
Amortization of quotas - concession and authorization | [1] |  |  |  |  |  |
Loss on disposal |  |  |  |  |  |  |
Transfers to contract assets |  |  |  | (19,471) |  |  |
Transfers from contract assets |  |  |  |  |  |  |
Intangible assets, ending |  |  |  |  |  | 19,471 |
Gas Distribution [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 3,619 |  | 43,888 |  |  |
Transfers from property, plant and equipment |  | 24,835 |  |  |  |  |
Capitalizations for intangible in service |  |  |  |  |  |  |
Amortization of quotas - concession and authorization |  | (28,454) | [1] | (22,759) |  |  |
Loss on disposal |  |  |  | (81) |  |  |
Transfers to contract assets |  |  |  | (19,471) |  |  |
Transfers from contract assets |  |  |  | 2,042 |  |  |
Intangible assets, ending |  |  |  | 3,619 |  | 43,888 |
Other in Service [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 25,630 |  | 22,693 |  |  |
Acquisitions |  |  |  |  |  |  |
Transfers from property, plant and equipment |  | (1,471) |  | 112 |  |  |
Capitalizations for intangible in service |  | 16,118 |  | 9,448 |  |  |
Amortization of quotas - concession and authorization |  | 8,646 |  | (6,410) | [4] |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  | (11) |  | (23) |  |  |
Loss on disposal |  |  |  | (190) |  |  |
Intangible assets, ending |  | 31,620 |  | 25,630 |  | 22,693 |
Other in Progress [Member] |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 15,933 |  | 16,149 |  |  |
Acquisitions |  | 5,032 |  | 7,589 |  |  |
Transfers from property, plant and equipment |  | 10,217 |  | 1,979 |  |  |
Capitalizations for intangible in service |  | (16,118) |  | (9,448) |  |  |
Amortization of quotas - concession and authorization |  |  |  |  | [4] |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  |  |  |  |  |  |
Loss on disposal |  | (430) |  | (373) |  |  |
Intangible assets, ending |  | 14,634 |  | 15,933 |  | 16,149 |
Other |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Intangible assets, beginning |  | 41,563 |  | 38,842 |  |  |
Acquisitions |  | 5,032 |  | 7,589 |  |  |
Transfers from property, plant and equipment |  | 8,746 |  | 2,091 |  |  |
Capitalizations for intangible in service |  |  |  |  |  |  |
Amortization of quotas - concession and authorization |  | (8,646) |  | (6,410) | [4] |  |
Amortization of quotas - PIS/Pasep and Cofins credits |  | (11) |  | (23) |  |  |
Loss on disposal |  | (430) |  | (563) |  |  |
Intangible assets, ending |  | R$ 46,254 |  | R$ 41,563 |  | R$ 38,842 |
[1] | Amortization during the concession as of the start of commercial operations of the enterprises or based on the useful life of the assets, of the two the shortest.
[2] | Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
[3] | Includes the balances of use of public asset and hydrological risk renegotiation
[4] | Annual amortization rate: 20%.

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