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Fixed assets (Schedule of Fixed Assets) (Details)
€ in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
EUR (€)
Jun. 30, 2022
USD ($)
 [2]
Dec. 31, 2021
EUR (€)
Disclosure of detailed information about property, plant and equipment [line items]      
Balance [1] € 340,897    
Balance 352,680 $ 366,424 € 340,897 [1]
Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 233,730    
Balance 232,861   233,730
Pumped storage [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 78,892    
Balance 92,606   78,892
Biogas installation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 28,240    
Balance 27,174   28,240
Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 35    
Balance 39   35
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 365,301   274,520
Additions 19,158   90,779
Effect of changes in exchange rates (1)   2
Balance 384,458   365,301
Cost [member] | Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 251,027   223,626
Additions 4,999   27,401
Effect of changes in exchange rates 0   0
Balance 256,026   251,027
Cost [member] | Pumped storage [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 78,892   16,607
Additions 13,714   62,285
Effect of changes in exchange rates 0   0
Balance 92,606   78,892
Cost [member] | Biogas installation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 35,192   34,107
Additions 431   1,085
Effect of changes in exchange rates 0   0
Balance 35,623   35,192
Cost [member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance 190   180
Additions 14   8
Effect of changes in exchange rates (1)   2
Balance 203   190
Depreciation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance (24,404)   (10,425)
Depreciation for the year 7,375   13,977
Effect of changes in exchange rates (1)   2
Balance (31,778)   (24,404)
Depreciation [Member] | Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance (17,297)   (6,286)
Depreciation for the year 5,868   11,011
Effect of changes in exchange rates 0   0
Balance (23,165)   (17,297)
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
Effect of changes in exchange rates 0   0
Balance 0   0
Depreciation [Member] | Biogas installation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance (6,952)   (4,002)
Depreciation for the year 1,497   2,950
Effect of changes in exchange rates 0   0
Balance (8,449)   (6,952)
Depreciation [Member] | Office furniture and equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance (155)   (137)
Depreciation for the year 10   16
Effect of changes in exchange rates (1)   2
Balance € (164)   € (155)
[1] Reclassified, please see Note 2C.
[2] * Convenience translation into US$ (exchange rate as at June 30, 2022: EUR 1 = US$1.039)