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9 Revenue from sales and energy purchases (Details 1) $ in Millions | 12 Months Ended
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Dec. 31, 2020 ARS ($) MWh | Dec. 31, 2019 ARS ($) MWh | Dec. 31, 2018 ARS ($) MWh
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Total - Revenue |  | $ 91,316 | $ 122,437 | $ 117,120
T1 (small demand segment) [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Sale of energy | MWh |  | 11,600,000 | 10,768,000 | 11,482,000
Total - Revenue |  | $ 57,356 | $ 72,579 | $ 78,952
T2 (medium demand segment) [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Sale of energy | MWh |  | 1,341,000 | 1,549,000 | 1,668,000
Total - Revenue |  | $ 10,544 | $ 15,975 | $ 12,658
T3 (large demand segment) [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Sale of energy | MWh |  | 3,210,000 | 3,503,000 | 3,646,000
Total - Revenue |  | $ 19,830 | $ 31,947 | $ 23,579
Other demand segment [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Sale of energy | MWh |  | 4,028,000 | 4,154,000 | 4,376,000
Total - Revenue |  | $ 3,112 | $ 1,431 | $ 1,379
Subtotal - Sales of electricity [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Sale of energy | MWh |  | 20,179,000 | 19,974,000 | 21,172,000
Total - Revenue |  | $ 90,842 | $ 121,932 | $ 116,568
Right of use of poles [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Total - Revenue |  | 421 | 386 | 398
Connection and reconnection charges [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Total - Revenue |  | 53 | 119 | 154
Subtotal Other services [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Total - Revenue |  | $ 474 | $ 505 | $ 552
Energy purchase [member] |  |  |  |
Disclosure of information about activities subject to rate regulation [line items] |  |  |  |
Sale of energy | MWh | [1] | 25,124,000 | 24,960,000 | 25,906,000
Total - Revenue | [1] | $ (57,930) | $ (77,649) | $ (66,721)
[1] | As of December 31, 2020, 2019 and 2018, includes technical and non-technical energy losses for 4,945 GWh, 4,986 GWh and 4,734 GWh, respectively.

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- Definition Information about the sale of energy. + References No definition available. + Details
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Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of revenue arising from the sale of electricity. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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