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Fixed Assets (Details) - Schedule of Fixed Assets - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cost [Member]    
Cost    
Balance beginning € 405,113 € 365,301
Additions 63,759 45,356
Transfer to disposal groups held for sale (18)  
Effect of changes in exchange rates (6,127) (5,544)
Balance ending 462,727 405,113
Cost [Member] | Photovoltaic plants [Member]    
Cost    
Balance beginning 266,062 251,027
Additions 19,762 15,036
Transfer to disposal groups held for sale  
Effect of changes in exchange rates (108) (1)
Balance ending 285,716 266,062
Cost [Member] | Pumped storage [Member]    
Cost    
Balance beginning 102,472 78,892
Additions 42,178 29,124
Transfer to disposal groups held for sale  
Effect of changes in exchange rates (6,019) (5,544)
Balance ending 138,631 102,472
Cost [Member] | Biogas plants [Member]    
Cost    
Balance beginning 36,355 35,192
Additions 1,792 1,163
Transfer to disposal groups held for sale  
Effect of changes in exchange rates
Balance ending 38,147 36,355
Cost [Member] | Office furniture and equipment [Member]    
Cost    
Balance beginning 224 190
Additions 27 33
Transfer to disposal groups held for sale (18)  
Effect of changes in exchange rates 1
Balance ending 233 224
Depreciation [Member]    
Cost    
Balance beginning 39,357 24,404
Depreciation for the year 15,405 14,954
Transfer to disposal groups held for sale (18)  
Effect of changes in exchange rates 1 (1)
Balance ending 54,745 39,357
Depreciation [Member] | Photovoltaic plants [Member]    
Cost    
Balance beginning 29,530 17,297
Depreciation for the year 12,736 12,233
Transfer to disposal groups held for sale  
Effect of changes in exchange rates
Balance ending 42,266 29,530
Depreciation [Member] | Pumped storage [Member]    
Cost    
Balance beginning
Depreciation for the year
Transfer to disposal groups held for sale  
Effect of changes in exchange rates
Balance ending
Depreciation [Member] | Biogas plants [Member]    
Cost    
Balance beginning 9,652 6,952
Depreciation for the year 2,644 2,700
Transfer to disposal groups held for sale  
Effect of changes in exchange rates
Balance ending 12,296 9,652
Depreciation [Member] | Office furniture and equipment [Member]    
Cost    
Balance beginning 175 155
Depreciation for the year 25 21
Transfer to disposal groups held for sale (18)  
Effect of changes in exchange rates 1 (1)
Balance ending 183 175
Carrying amounts [Member]    
Cost    
Balance beginning 365,756 340,897
Balance ending 407,982 365,756
Carrying amounts [Member] | Photovoltaic plants [Member]    
Cost    
Balance beginning 236,532 233,730
Balance ending 243,450 236,532
Carrying amounts [Member] | Pumped storage [Member]    
Cost    
Balance beginning 102,472 78,892
Balance ending 138,631 102,472
Carrying amounts [Member] | Biogas plants [Member]    
Cost    
Balance beginning 26,703 28,240
Balance ending 25,851 26,703
Carrying amounts [Member] | Office furniture and equipment [Member]    
Cost    
Balance beginning 49 35
Balance ending € 50 € 49