| Unit | 2020 | 2018 | 2016 | % change (2018 – 2020) | |
| Produced products | t | 53,991 | 64,840 | 81,154 | –16.73% |
| Fossil energy (total) | kWh | 125,095,638 | 145,525,724 | 151,487,778 | –14.04% |
| thereof, natural gas | kWh | 125,094,079 | 145,315,802 | 151,234,328 | –13.92% |
| thereof, heating oil | kWh | 1,559 | 209,922 | 253,450 | –99.26% |
| Electricity (total) | kWh | 27,896,714 | 31,942,746 | 29,530,515 | –12.67% |
| Fresh-water volume | m3 | 746,075 | 879,260 | 812,777 | –15.15% |
| Wastewater volume | m3 | 888,542 | 1,019,488 | 1,089,813 | –12.84% |
| Energy/output (fossil) | kWh/t | 2,317.0 | 2,244.4 | 1,866.7 | 3.23% |
| Energy/output (electricity) | kWh/t | 516.7 | 492.6 | 363.9 | 4.88% |
| Fresh water | m3/t 2 | 13.8 | 13.6 | 10.0 | 1.90% |
| Wastewater | m3/t 2 | 16.5 | 15.7 | 13.4 | 4.67% |
| CO2 emissions | t | 29,566 | 34,340 | 35,178 | –13.90% |
| CO2 emissions/prod. product | kg/t | 547.6 | 529.6 | 433.5 | 3.4% |