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8. INVESTMENTS (Details 8)
 12 Months Ended
Dec. 31, 2019
Estimated Costs  
InvestmentsLineItems [Line Items]  
Main assumptions (Until 2057) Costs based on studies and market trends.
Growth rate in perpetuity  
InvestmentsLineItems [Line Items]  
Main assumptions (Until 2057) Growth rate was not considered due to the projection model until the end of the concession.
Discount rate  
InvestmentsLineItems [Line Items]  
Main assumptions (Until 2057) Between 5.09% to 6.98% in real terms.
Gross Margin  
InvestmentsLineItems [Line Items]  
Main assumptions (Until 2057) Based on market studies to capture operations costs and loads, based on studies of market trends.