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Fixed assets (Schedule of Fixed Assets) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Balance € 114,389  
Balance 264,095 € 114,389
Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 233,626  
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 122,571 117,135
Additions 138,045 74,343
New companies 17,233  
Disposals (52) (68,908)
Effect of changes in exchange rates (5) 1
Balance 277,792 122,571
Gross carrying amount [member] | Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 102,784 98,289
Additions 120,842 73,402 [1]
New companies  
Disposals (68,908) [1]
Effect of changes in exchange rates 1
Balance 223,626 102,784
Gross carrying amount [member] | Pumped storage [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance
Additions 16,607
New companies  
Disposals
Effect of changes in exchange rates
Balance 16,607
Gross carrying amount [member] | Biogas installation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 19,588 18,656
Additions 558 932
New companies 17,233  
Disposals
Effect of changes in exchange rates
Balance 37,379 19,588
Gross carrying amount [member] | Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 147 138
Additions 38 9
New companies  
Disposals
Effect of changes in exchange rates (5)
Balance 180 147
Gross carrying amount [member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 52 52
Additions
New companies  
Disposals (52)
Effect of changes in exchange rates
Balance 52
Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 8,182 29,915
Depreciation for the year 2,299 5,744
New companies 3,272  
Disposals (52) (27,477)
Effect of changes in exchange rates (4)  
Balance 13,697 8,182
Depreciation [Member] | Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 5,456 28,550
Depreciation for the year 830 4,383
New companies  
Disposals (27,477) [1]
Effect of changes in exchange rates  
Balance 6,286 5,456
Depreciation [Member] | Pumped storage [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance
Depreciation for the year
New companies  
Disposals
Effect of changes in exchange rates  
Balance
Depreciation [Member] | Biogas installation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 2,545 1,192
Depreciation for the year 1,457 1,353
New companies 3,272  
Disposals
Effect of changes in exchange rates  
Balance 7,274 2,545
Depreciation [Member] | Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 129 121
Depreciation for the year 12 8
New companies  
Disposals
Effect of changes in exchange rates (4)  
Balance 137 129
Depreciation [Member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 52 52
Depreciation for the year
New companies  
Disposals (52)
Effect of changes in exchange rates  
Balance 52
Carrying Amounts [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 114,389 87,220
Balance 264,095 114,389
Carrying Amounts [Member] | Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 97,328 69,739
Balance 217,340 97,328
Carrying Amounts [Member] | Pumped storage [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance
Balance 16,607
Carrying Amounts [Member] | Biogas installation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 17,043 17,464
Balance 30,105 17,043
Carrying Amounts [Member] | Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 18 17
Balance 43 18
Carrying Amounts [Member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance
Balance
[1] See Note 6C