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2 Regulatory framework (Details) - ENRE [member]
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Disclosure of information about activities subject to rate regulation [line items]      
Date of application Aug. 20 Feb. 20 Aug. 19 [1]
CPD adjustment 12.97% 24.65% 19.05%
[1] The CPD adjustment applicable in August 2019 was deferred until January 2020 by means of the Electricity Rate Schedule Maintenance Agreement, and was finally not applied.