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Intangible assets (Tables)
 12 Months Ended
Dec. 31, 2022
Intangible Assets  
Schedule of intangible assets
   
  12.31.2022 12.31.2021
Concession agreement - distribution of electricity (17.1) 7,257,827 6,596,184
Generation concession agreements/ authorization (17.2) 2,252,615 2,473,858
Concession agreement - piped gas distribution (17.3)  726,107 96,145
Other intangible assets (17.4)  41,178 49,373
   10,277,727 9,215,560
Schedule of changes in intangible assets
     
  Intangible asset Special liabilities  
  in service in service Total 
Balance as of January 1, 2021  8,953,486 (2,750,099)  6,203,387
Transfers from accounts receivable - concessions (Note 10.1) - (8,385) (8,385)
Transfers from contract assets (Note 10.1)  943,905 (122,346)  821,559
Transfers to other receivables (3,563) - (3,563)
Amortization quotas - concession (a) (522,525)  146,697 (375,828)
Amortization quotas - PIS/Pasep and Cofins credits (10,363) - (10,363)
Loss on disposal (30,623) - (30,623)
Balance as of December 31, 2021  9,330,317 (2,734,133)  6,596,184
Transfers from contract assets (Note 10.1)  1,332,118 (194,794)  1,137,324
Transfers to other receivables  (955) -  (955)
Amortization quotas - concession (a) (564,252)  153,503 (410,749)
Amortization quotas - PIS/Pasep and Cofins credits (10,483) - (10,483)
Loss on disposal (53,494) - (53,494)
Balance as of December 31, 2022  10,033,251 (2,775,424)  7,257,827
(a) Amortization during the concession period after the transfer to intangible assets in service of useful life of the assets, whichever the lower.
.Schedule of generation concession agreements
       
    Concession  Concession and  
    contract (a) authorization  
  in service  in progress rights/ goodwill Total 
Balance as of January 1, 2021 195,622 - 358,218 553,840
Effect of acquisition of control of Vilas Complex  - - 277,120 277,120
Technical goodwill arising from the business combination - Vilas Complex   - - 94,221 94,221
ANEEL grant - use of public property 63,446  1,823  - 65,269
Amortization quotas - concession and authorization (b)  (72,148) -  (14,987)  (87,135)
Capitalizations for intangible in service 1,823 (1,823)  -  
Hydrological Risk Renegotiation - GSF  1,570,543 -  -  1,570,543
Balance as of December 31, 2021  1,759,286 - 714,572  2,473,858
Effect of acquisition of control of Vilas Complex (Note 1.1.1)  - - 23,982 23,982
Technical goodwill arising from the business combination - Vilas Complex (Note 1.1.1)  - - 8,154  8,154
Amortization quotas - concession and authorization (b)  (228,509) -  (24,870)  (253,379)
Balance as of December 31, 2022  1,530,777 - 721,838  2,252,615
(a) Includes the balances of use of public asset and hydrological risk renegotiation
(b) Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
.Schedule of piped gas distribution service concession
 
Balance as of January 1, 2021 132,366
Transfers from contract assets (Note 10.2) 3,398
Transfers from accounts receivable - concessions (Note 9.2)  (1,398)
Amortization quotas - concession  (38,221)
Balance as of December 31, 2021 96,145
Additions - renewal of the concession 413,410
Transfers from contract assets (Note 10.2) 13,738
Transfers to accounts receivable - concessions (Note 9.2) 243,628
Amortization quotas - concession  (40,690)
Loss on disposal (124)
Balance as of December 31, 2022 726,107
Schedule of other intangible assets
     
  in service  in progress Total 
Balance as of January 1, 2021 19,209 20,654 39,863
Effect of acquisition of control of Vilas Complex 10,275  - 10,275
Acquisitions  - 10,375 10,375
Transfers from property, plant and equipment  986  482 1,468
Capitalizations for intangible in service 4,453  (4,453)  -
Amortization quotas (a)  (7,770)  -  (7,770)
Amortization quotas - PIS/Pasep and Cofins credits  (5)  -  (5)
Partial division of assets  (5,047) (526)  (5,573)
(-) Reclassification (b)  141  599  740
Balance as of December 31, 2021 22,242 27,131 49,373
Acquisitions  - 8,319 8,319
Transfers from property, plant and equipment  (9,795)  -  (9,795)
Capitalizations for intangible in service 5,561  (5,561)  -
Amortization quotas (a)  (5,160)  -  (5,160)
Loss on disposal  -  (1,559)  (1,559)
Balance as of December 31, 2022 12,848 28,330 41,178
(a) Annual amortization rate: 20%.
(b) Reclassification to Assets classified as held for sale (Note 39).