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9 Revenue from sales and energy purchases (Details 1)
$ in Millions
 12 Months Ended
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.