v3.26.1
Financial instruments - Carrying amount and fair value (Details) - EUR (€)
€ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financial instruments    
Carrying amount of financial assets € 5,455,806 € 5,845,634
Carrying amount of financial liabilities 14,388,146 13,400,213
Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 10,029,801 9,091,942
FVPL - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 69,035 21,872
Not classified    
Financial instruments    
Carrying amount of financial liabilities 4,289,310 4,286,399
Accounts payable to unrelated parties    
Financial instruments    
Carrying amount of financial liabilities 799,865 722,974
Accounts payable to unrelated parties | Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 799,865 722,974
Accounts payable to related parties    
Financial instruments    
Carrying amount of financial liabilities 81,352 97,951
Accounts payable to related parties | Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 81,352 97,951
Short-term debt    
Financial instruments    
Carrying amount of financial liabilities 464,648 17,015
Short-term debt | Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 464,648 17,015
Long-term debt    
Financial instruments    
Carrying amount of financial liabilities 7,101,262 7,287,881
Long-term debt | Level 1    
Financial instruments    
Fair value of financial liabilities 6,380,373 6,716,223
Long-term debt | Level 2    
Financial instruments    
Fair value of financial liabilities 428,006 318,336
Long-term debt | Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 7,101,262 7,287,881
Lease liabilities    
Financial instruments    
Carrying amount of financial liabilities 3,397,435 3,490,709
Lease liabilities | Not classified    
Financial instruments    
Carrying amount of financial liabilities 3,397,435 3,490,709
Other current and non-current liabilities    
Financial instruments    
Carrying amount of financial liabilities 2,543,584 1,783,683
Other current and non-current liabilities | Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 1,582,674 966,121
Other current and non-current liabilities | FVPL - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 69,035 21,872
Other current and non-current liabilities | Not classified    
Financial instruments    
Carrying amount of financial liabilities 891,875 795,690
Derivatives - cash flow hedging instruments    
Financial instruments    
Carrying amount of financial liabilities 23,677 2,647
Derivatives - cash flow hedging instruments | Level 2    
Financial instruments    
Fair value of financial liabilities 23,677 2,647
Derivatives - cash flow hedging instruments | Not classified    
Financial instruments    
Carrying amount of financial liabilities 23,677 2,647
Derivatives - not designated as hedging instruments    
Financial instruments    
Carrying amount of financial liabilities 48,812 9,147
Derivatives - not designated as hedging instruments | Level 2    
Financial instruments    
Fair value of financial liabilities 48,812 9,147
Derivatives - not designated as hedging instruments | FVPL - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 48,812 9,147
Derivatives embedded in vPPAs    
Financial instruments    
Carrying amount of financial liabilities 13,553 9,463
Derivatives embedded in vPPAs | Level 3    
Financial instruments    
Fair value of financial liabilities 13,553 9,463
Derivatives embedded in vPPAs | FVPL - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 13,553 9,463
Variable payments outstanding for acquisitions    
Financial instruments    
Carrying amount of financial liabilities 6,670 3,262
Variable payments outstanding for acquisitions | Level 3    
Financial instruments    
Fair value of financial liabilities 6,670 3,262
Variable payments outstanding for acquisitions | FVPL - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 6,670 3,262
Put option liabilities    
Financial instruments    
Carrying amount of financial liabilities 868,198 793,043
Put option liabilities | Level 3    
Financial instruments    
Fair value of financial liabilities 868,198 793,043
Put option liabilities | Not classified    
Financial instruments    
Carrying amount of financial liabilities 868,198 793,043
Other financial liabilities    
Financial instruments    
Carrying amount of financial liabilities 1,582,674 966,121
Other financial liabilities | Amortized cost - Liabilities    
Financial instruments    
Carrying amount of financial liabilities 1,582,674 966,121
Amortized cost - Assets    
Financial instruments    
Carrying amount of financial assets 4,479,944 4,756,889
FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 343,218 481,357
FVOCI - Assets    
Financial instruments    
Carrying amount of financial assets 439,060 414,792
Not classified    
Financial instruments    
Carrying amount of financial assets 193,584 192,596
Cash and cash equivalents    
Financial instruments    
Carrying amount of financial assets 1,061,251 1,599,113
Cash and cash equivalents | Level 1    
Financial instruments    
Fair value of financial assets 109,941 257,992
Cash and cash equivalents | Amortized cost - Assets    
Financial instruments    
Carrying amount of financial assets 951,310 1,341,121
Cash and cash equivalents | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 109,941 257,992
Trade accounts and other receivables from unrelated parties    
Financial instruments    
Carrying amount of financial assets 3,281,356 3,107,503
Trade accounts and other receivables from unrelated parties | Amortized cost - Assets    
Financial instruments    
Carrying amount of financial assets 3,186,023 3,018,004
Trade accounts and other receivables from unrelated parties | Not classified    
Financial instruments    
Carrying amount of financial assets 95,333 89,499
Accounts receivable from related parties    
Financial instruments    
Carrying amount of financial assets 29,569 32,683
Accounts receivable from related parties | Amortized cost - Assets    
Financial instruments    
Carrying amount of financial assets 29,569 32,683
Other current and non-current assets    
Financial instruments    
Carrying amount of financial assets 1,083,630 1,106,335
Other current and non-current assets | Amortized cost - Assets    
Financial instruments    
Carrying amount of financial assets 313,042 365,081
Other current and non-current assets | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 233,277 223,365
Other current and non-current assets | FVOCI - Assets    
Financial instruments    
Carrying amount of financial assets 439,060 414,792
Other current and non-current assets | Not classified    
Financial instruments    
Carrying amount of financial assets 98,251 103,097
Derivatives - cash flow hedging instruments    
Financial instruments    
Carrying amount of financial assets 7,029 13,856
Derivatives - cash flow hedging instruments | Level 2    
Financial instruments    
Fair value of financial assets 7,029 13,856
Derivatives - cash flow hedging instruments | Not classified    
Financial instruments    
Carrying amount of financial assets 7,029 13,856
Derivatives - not designated as hedging instruments    
Financial instruments    
Carrying amount of financial assets 9,731 11,546
Derivatives - not designated as hedging instruments | Level 2    
Financial instruments    
Fair value of financial assets 9,731 11,546
Derivatives - not designated as hedging instruments | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 9,731 11,546
Derivatives embedded in vPPAs    
Financial instruments    
Carrying amount of financial assets 1,213 7,730
Derivatives embedded in vPPAs | Level 3    
Financial instruments    
Fair value of financial assets 1,213 7,730
Derivatives embedded in vPPAs | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 1,213 7,730
Equity investments    
Financial instruments    
Carrying amount of financial assets 94,331 89,508
Equity investments | Level 1    
Financial instruments    
Fair value of financial assets 12,707 15,239
Equity investments | Level 2    
Financial instruments    
Fair value of financial assets 64,365 60,498
Equity investments | Level 3    
Financial instruments    
Fair value of financial assets 17,259 13,771
Equity investments | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 31,967 31,011
Equity investments | FVOCI - Assets    
Financial instruments    
Carrying amount of financial assets 62,364 58,497
Debt securities    
Financial instruments    
Carrying amount of financial assets 457,802 430,219
Debt securities | Level 1    
Financial instruments    
Fair value of financial assets 457,802 430,219
Debt securities | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 81,106 73,924
Debt securities | FVOCI - Assets    
Financial instruments    
Carrying amount of financial assets 376,696 356,295
Other financial assets    
Financial instruments    
Carrying amount of financial assets 513,524 553,476
Other financial assets | Level 3    
Financial instruments    
Fair value of financial assets 109,260 99,154
Other financial assets | Amortized cost - Assets    
Financial instruments    
Carrying amount of financial assets 313,042 365,081
Other financial assets | FVPL - Assets    
Financial instruments    
Carrying amount of financial assets 109,260 99,154
Other financial assets | Not classified    
Financial instruments    
Carrying amount of financial assets € 91,222 € 89,241