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Schedule of power distribution service concession contract (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Contract assets, beginning | R$ 5,492,797 |  |
Transfers to intangible assets | (30,623) | R$ (52,811) | R$ (26,368)
Contract assets, ending | (7,155) | (35,590) | (7,949)
Contract assets, beginning | 6,888,048 | 5,492,797 |
Power Distribution Service Concession [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Contract assets, beginning | 1,114,961 | 844,284 |
Acquisitions | 1,765,226 | 1,391,267 |
Customers contributions | (160,826) | (112,689) |
Provision for legal claims added to the cost of the works | 33,040 | 1,522 |
Transfers to intangible assets | (821,559) | (911,366) |
Transfers to accounts receivable related to concession |  | (86,154) |
Contract assets, ending | (7,155) | (11,903) |
Transfers to accounts receivable related to concession | (125,492) |  |
Contract assets, beginning | 1,798,195 | 1,114,961 | 844,284
Power Distribution Service Concession [Member] | Assets Contract Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Contract assets, beginning | 1,144,780 | 875,354 |
Acquisitions | 1,765,226 | 1,391,267 |
Provision for legal claims added to the cost of the works | 33,040 | 1,522 |
Transfers to intangible assets | (943,905) | (1,016,482) |
Transfers to accounts receivable related to concession | (94,978) |  |
Contract assets, ending | (7,155) | (11,903) |
Transfers to accounts receivable related to concession | (140,120) |  |
Contract assets, beginning | 1,851,866 | 1,144,780 | 875,354
Power Distribution Service Concession [Member] | Special Liabilities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Contract assets, beginning | (29,819) | (31,070) |
Acquisitions |  |  |
Customers contributions | (160,826) | (112,689) |
Provision for legal claims added to the cost of the works |  |  |
Transfers to intangible assets | 122,346 | 105,116 |
Transfers to accounts receivable related to concession |  | 8,824 |
Contract assets, ending | (53,671) |  |
Transfers to accounts receivable related to concession | R$ 14,628 |  |
Contract assets, beginning |  | R$ (29,819) | R$ (31,070)

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