Hello,
thank you for the kind answer, the tip to check the undefined UPR already helped a lot and I think I can work from there on.
However, this brought up a follow-up-question: I realized that in the UPRs for the cogeneration processes of natural gas, biogas and oil I can find information on the heating values (e.g. natural gas: 39 MJ/m³). In the processes for energy cogeneration using lignite or hard coal I can't find this information.
Is this information missing or can I find these assumptions in some sort of report? Do you have a standarized number for these two fuels (lignite and hard coal), which was used by ecoinvent as the heating value?
Thank you and best regards