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Generated and operated energy hydroelectic units remuneration (Details)
 12 Months Ended
Dec. 31, 2021
Minimum Remuneration To Thermal Power Generator [Member]  
IfrsStatementLineItems [Line Items]  
[custom:Remuneration1] Generated energy
SRRYME No. 1/19 (US$ / MW-month) 3.5
SE No. 31/20 ($ / MW-month) 210
SE No. 440/21 ($ / MW-month) 271
Minimum Remuneration To Thermal Power Generator 1 [Member]  
IfrsStatementLineItems [Line Items]  
[custom:Remuneration1] Operated energy
SRRYME No. 1/19 (US$ / MW-month) 1.4
SE No. 31/20 ($ / MW-month) 84
SE No. 440/21 ($ / MW-month) 108