v3.25.2
Fixed Assets - Schedule of Fixed Assets (Details) - EUR (€)
€ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Cost [Member]    
Cost    
Beginning Balance € 552,260 € 462,727
Additions 38,331 82,037
Transfer to disposal groups held for sale   (2,910)
Effect of changes in exchange rates (12,932) 10,406
Ending Balance 577,659 552,260
Cost [Member] | Solar plants [Member]    
Cost    
Beginning Balance 351,414 288,208
Additions 31,549 64,119
Transfer to disposal groups held for sale   (2,910)
Effect of changes in exchange rates (6,495) 1,997
Ending Balance 376,468 351,414
Cost [Member] | Pumped storage [Member]    
Cost    
Beginning Balance 160,844 136,139
Additions 6,092 16,296
Transfer to disposal groups held for sale  
Effect of changes in exchange rates (6,437) 8,409
Ending Balance 160,499 160,844
Cost [Member] | Biogas plants [Member]    
Cost    
Beginning Balance 39,643 38,147
Additions 574 1,496
Transfer to disposal groups held for sale  
Effect of changes in exchange rates
Ending Balance 40,217 39,643
Cost [Member] | Office furniture and equipment [Member]    
Cost    
Beginning Balance 359 233
Additions 116 126
Transfer to disposal groups held for sale  
Effect of changes in exchange rates
Ending Balance 475 359
Depreciation [Member]    
Cost    
Beginning Balance 69,513 54,745
Effect of changes in exchange rates  
Ending Balance 77,668 69,513
Depreciation    
Depreciation for the period 8,155 15,258
Disposals   (490)
Depreciation [Member] | Solar plants [Member]    
Cost    
Beginning Balance 54,715 42,266
Effect of changes in exchange rates  
Ending Balance 61,474 54,715
Depreciation    
Depreciation for the period 6,759 12,939
Disposals   (490)
Depreciation [Member] | Pumped storage [Member]    
Cost    
Beginning Balance
Effect of changes in exchange rates  
Ending Balance
Depreciation    
Depreciation for the period
Disposals  
Depreciation [Member] | Biogas plants [Member]    
Cost    
Beginning Balance 14,592 12,296
Effect of changes in exchange rates  
Ending Balance 15,951 14,592
Depreciation    
Depreciation for the period 1,359 2,296
Disposals  
Depreciation [Member] | Office furniture and equipment [Member]    
Cost    
Beginning Balance 206 183
Effect of changes in exchange rates  
Ending Balance 243 206
Depreciation    
Depreciation for the period 37 23
Disposals  
Carrying Amounts [Member]    
Cost    
Beginning Balance 482,747  
Ending Balance 499,991 482,747
Carrying Amounts [Member] | Solar plants [Member]    
Cost    
Beginning Balance 296,699  
Ending Balance 314,994 296,699
Carrying Amounts [Member] | Pumped storage [Member]    
Cost    
Beginning Balance 160,844  
Ending Balance 160,499 160,844
Carrying Amounts [Member] | Biogas plants [Member]    
Cost    
Beginning Balance 25,051  
Ending Balance 24,266 25,051
Carrying Amounts [Member] | Office furniture and equipment [Member]    
Cost    
Beginning Balance 153  
Ending Balance € 232 € 153