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20. INTANGIBLE ASSETS (Details 3)
 12 Months Ended
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]  
Annual average amortization rate 4.01%
Hydroelectric Generation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual average amortization rate 19.74%
Wind Power Generation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual average amortization rate 16.90%
Administration [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual average amortization rate 16.03%
Distribution [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual average amortization rate 3.88%
Gas [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual average amortization rate 2.87%