XML 98 R86.htm IDEA: XBRL DOCUMENT v3.8.0.1
8. INVESTMENTS (Details 6)
 12 Months Ended
Dec. 31, 2017
Gross Margin  
Disclosure of fair value measurement of assets [line items]  
Main assumptions (Until 2057) Based on market studies to capture operations costs and loads, according studied of market trends.
Estimated Costs  
Disclosure of fair value measurement of assets [line items]  
Main assumptions (Until 2057) Costs based on studies and market trends.
Growth rate in perpetuity  
Disclosure of fair value measurement of assets [line items]  
Main assumptions (Until 2057) Growth rate was not considered due to the projection model until the end of the concession.
Discount rate  
Disclosure of fair value measurement of assets [line items]  
Main assumptions (Until 2057)

Between 5.1% to 6.25% in real terms.