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Fixed Assets - Schedule of Fixed Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cost [Member]    
Cost    
Balance beginning € 462,727 € 405,113
Additions 82,037 63,759
Disposals (2,910)  
Effect of changes in exchange rates 10,406 (6,127)
Balance ending 552,260 462,727
Transfer to disposal groups held for sale   (18)
Cost [Member] | Solar plants [Member]    
Cost    
Balance beginning [1] 288,208 268,474
Additions 64,119 19,841
Disposals (2,910)  
Effect of changes in exchange rates 1,997 (107)
Balance ending 351,414 288,208 [1]
Transfer to disposal groups held for sale  
Cost [Member] | Pumped storage [Member]    
Cost    
Balance beginning [1] 136,139 100,059
Additions 16,296 42,099
Disposals  
Effect of changes in exchange rates 8,409 (6,019)
Balance ending 160,844 136,139 [1]
Transfer to disposal groups held for sale  
Cost [Member] | Biogas plants [Member]    
Cost    
Balance beginning 38,147 36,355
Additions 1,496 1,792
Disposals  
Effect of changes in exchange rates
Balance ending 39,643 38,147
Transfer to disposal groups held for sale  
Cost [Member] | Office furniture and equipment [Member]    
Cost    
Balance beginning 233 225
Additions 126 27
Disposals  
Effect of changes in exchange rates (1)
Balance ending 359 233
Transfer to disposal groups held for sale   (18)
Depreciation [Member]    
Cost    
Balance beginning 54,745 39,357
Depreciation for the year 15,258 15,405
Disposals (490)  
Effect of changes in exchange rates   1
Balance ending 69,513 54,745
Transfer to disposal groups held for sale   (18)
Depreciation [Member] | Solar plants [Member]    
Cost    
Balance beginning 42,266 29,530
Depreciation for the year 12,939 12,736
Disposals (490)  
Effect of changes in exchange rates  
Balance ending 54,715 42,266
Transfer to disposal groups held for sale  
Depreciation [Member] | Pumped storage [Member]    
Cost    
Balance beginning
Depreciation for the year
Disposals  
Effect of changes in exchange rates  
Balance ending
Transfer to disposal groups held for sale  
Depreciation [Member] | Biogas plants [Member]    
Cost    
Balance beginning 12,296 9,652
Depreciation for the year 2,296 2,644
Disposals  
Effect of changes in exchange rates  
Balance ending 14,592 12,296
Transfer to disposal groups held for sale  
Depreciation [Member] | Office furniture and equipment [Member]    
Cost    
Balance beginning 183 175
Depreciation for the year 23 25
Disposals  
Effect of changes in exchange rates   1
Balance ending 206 183
Transfer to disposal groups held for sale   (18)
Carrying Amounts [Member]    
Cost    
Balance beginning 407,982 365,756
Balance ending 482,747 407,982
Carrying Amounts [Member] | Solar plants [Member]    
Cost    
Balance beginning [1] 245,942 238,944
Balance ending 296,699 245,942 [1]
Carrying Amounts [Member] | Pumped storage [Member]    
Cost    
Balance beginning [1] 136,139 100,059
Balance ending 160,844 136,139 [1]
Carrying Amounts [Member] | Biogas plants [Member]    
Cost    
Balance beginning 25,851 26,703
Balance ending 25,051 25,851
Carrying Amounts [Member] | Office furniture and equipment [Member]    
Cost    
Balance beginning 50 50
Balance ending € 153 € 50
[1] Comparative amounts were reclassified, which resulted in €2,491 thousand and €2,412 thousand being reclassified as of December 31, 2023, and as of January 1, 2023, respectively, from pumped storage to solar plants.