| 2018 EUR 1 000  | CO2 emission  rights  | Computer  software  | Other intangible  assets  | Advance  payments  | Total  | 
| Acquisition cost 1 Jan | 677 | 21 320 | 21 782 | 0 | 43 779 | 
| Increase | 8 835 | 148 | 0 | 7 | 8 989 | 
| Decrease | -677 | -180 | -17 659 | 0 | -18 516 | 
| Acquisition cost 31 Dec | 8 834 | 21 288 | 4 123 | 7 | 34 253 | 
| Accumulated depreciation and  impairment charges according to plan 1 Jan  | 0  | 19 182  | 19 935  | 0  | 39 117  | 
| Accumulated depreciation from deduction | 0 | -180 | -17 659 | 0 | -17 838 | 
| Depreciation for the period | 0 | 399 | 1 242 | 0 | 1 641 | 
| Accumulated depreciation and  impairment charges according to plan 31 Dec  | 0  | 19 401  | 3 519  | 0  | 22 920  | 
| Book value 31 Dec 2018 | 8 834 | 1 887 | 605 | 7 | 11 333 | 
| Book value 1 Jan 2018 | 677 | 2 138 | 1 847 | 0 | 4 662 | 
2017 EUR 1 000  | CO2 emission rights  | Computer software  | Other intangible assets  | Advance payments  | Total  | 
| Acquisition cost 1 Jan | 2 662 | 21 176 | 21 782 | 0 | 45 620 | 
| Increase | 677 | 144 | 0 | 0 | 821 | 
| Decrease | -2 662 | 0 | 0 | 0 | -2 662 | 
| Acquisition cost 31 Dec | 677 | 21 320 | 21 782 | 0 | 43 779 | 
| Accumulated depreciation and  impairment charges according to plan 1 Jan  | 0  | 18 768  | 19 094  | 0  | 37 862  | 
| Depreciation for the period | 0 | 414 | 841 | 0 | 1 255 | 
| Accumulated depreciation and  impairment charges according to plan 31 Dec  | 0  | 19 182  | 19 935  | 0  | 39 117  | 
| Book value 31 Dec 2017 | 677 | 2 138 | 1 847 | 0 | 4 662 | 
| Book value 1 Jan 2017 | 2 662 | 2 408 | 2 688 | 0 | 7 758 | 
| 2018 Capitalized interest costs during construction EUR 1 000  | Other intangible assets  | Buildings and construction  | Machinery and equipment  | Other property, plant and equipment  | Advance payments  | Total  | 
| Acquisition cost 1 Jan | 3 530 | 31 133 | 112 781 | 2 609 | 1 254 377 | 1 404 429 | 
| Increase | 0 | 0 | 0 | 0 | 110 375 | 110 375 | 
| Decrease | -2 363 | -4 011 | -17 386 | -207 | -2 719 | -26 686 | 
| Acquisition cost 31 Dec | 1 167 | 27 122 | 95 394 | 2 402 | 1 362 033 | 1 488 118 | 
Accumulated depreciation and impairment charges according to plan 1 Jan  | 3 155  | 24 451  | 89 149  | 2 024  | 0  | 118 779  | 
| Accumulated depreciation from deduction | -2 363 | -4 011 | -17 386 | -207 | 0 | -23 967 | 
| Depreciation for the period | 107 | 444 | 1 693 | 33 | 0 | 2 277 | 
| Accumulated depreciation and  impairment charges according to plan 31 Dec  | 899  | 20 884  | 73 455  | 1 850  | 0  | 97 089  | 
| Book value 31 Dec 2018 | 268 | 6 238 | 21 939 | 552 | 1 362 033 | 1 391 030 | 
| Book value 1 Jan 2018 | 375 | 6 682 | 23 632 | 585 | 1 254 377 | 1 285 650 | 
2017 Capitalized interest costs during construction EUR 1 000  | Other intangible assets  | Buildings and construction  | Machinery and equipment  | Other property, plant and equipment  | Advance payments  | Total  | 
| Acquisition cost 1 Jan | 3 530 | 31 133 | 112 781 | 2 609 | 1 156 144 | 1 306 197 | 
| Increase | 0 | 0 | 0 | 0 | 102 180 | 102 180 | 
| Decrease | 0 | 0 | 0 | 0 | -3 947 | -3 947 | 
| Acquisition cost 31 Dec | 3 530 | 31 133 | 112 781 | 2 609 | 1 254 377 | 1 404 430 | 
Accumulated depreciation and impairment charges according to plan 1 Jan  | 3 049  | 24 007  | 87 457  | 1 990  | 0  | 116 503  | 
| Depreciation for the period | 106 | 444 | 1 692 | 34 | 0 | 2 276 | 
| Accumulated depreciation and  impairment charges according to plan 31 Dec  | 3 155  | 24 451  | 89 149  | 2 024  | 0  | 118 779  | 
| Book value 31 Dec 2017 | 375 | 6 682 | 23 632 | 585 | 1 254 377 | 1 285 651 | 
| Book value 1 Jan 2017 | 481 | 7 126 | 25 324 | 619 | 1 156 144 | 1 189 694 |