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Fixed assets (Schedule of Fixed Assets) (Details)
€ in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
USD ($)
 [1]
Dec. 31, 2020
EUR (€)
Disclosure of detailed information about property, plant and equipment [line items]      
Balance € 264,095    
Balance 312,983 $ 372,008 € 264,095
Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 217,340    
Balance 230,208   217,340
Pumped storage [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 16,607    
Balance 53,471   16,607
Biogas installation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 30,105    
Balance 29,266   30,105
Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 43    
Balance 38   43
Leasehold Improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 0    
Balance 0   0
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 277,792   122,571
Additions 55,382   138,045
New Companies     17,233
Disposals     (52)
Effect of changes in exchange rates     (5)
Balance 333,174   277,792
Cost [member] | Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 223,626   102,784
Additions 17,896   120,842
New Companies     0
Disposals     0
Effect of changes in exchange rates     0
Balance 241,522   223,626
Cost [member] | Pumped storage [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 16,607   0
Additions 36,864   16,607
New Companies     0
Disposals     0
Effect of changes in exchange rates     0
Balance 53,471   16,607
Cost [member] | Biogas installation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 37,379   19,588
Additions 620   558
New Companies     17,233
Disposals     0
Effect of changes in exchange rates     0
Balance 37,999   37,379
Cost [member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 180   147
Additions 2   38
New Companies     0
Disposals     0
Effect of changes in exchange rates     (5)
Balance 182   180
Cost [member] | Leasehold Improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 0   52
Additions 0   0
New Companies     0
Disposals     (52)
Effect of changes in exchange rates     0
Balance 0   0
Depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 13,697   8,182
New Companies     3,272
Depreciation for the year 6,494   2,299
Disposals     (52)
Effect of changes in exchange rates     (4)
Balance 20,191   13,697
Depreciation [Member] | Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 6,286   5,456
New Companies     0
Depreciation for the year 5,028   830
Disposals     0
Effect of changes in exchange rates     0
Balance 11,314   6,286
Depreciation [Member] | Pumped storage [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 0   0
Depreciation for the year 0   0
Disposals     0
Effect of changes in exchange rates     0
Balance 0   0
Depreciation [Member] | Biogas installation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 7,274   2,545
New Companies     3,272
Depreciation for the year 1,459   1,457
Disposals     0
Effect of changes in exchange rates     0
Balance 8,733   7,274
Depreciation [Member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 137   129
Depreciation for the year 7   12
Disposals     0
Effect of changes in exchange rates     (4)
Balance 144   137
Depreciation [Member] | Leasehold Improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 0   52
Depreciation for the year 0   0
Disposals     (52)
Effect of changes in exchange rates     0
Balance € 0   € 0
[1] Convenience translation into US$ (exchange rate as at June 30, 2021: EUR 1 = US$ 1.189)