Energy Inputs providing enourmous negative CO2eq contribute

Question

For some reason, without me changing anything (as far as i know), when i directly calculate the impact of a process (EF 3.1 and IPCC2021 methods) while all inputs provide a positive (>0) CO2eq contribute, all electricity and gas entries render very large negative and irrealistic CO2eq contributions, which didn't happen before, they would in fact give normal coherent positive contributes. Also if i calculate the individual gas/electricity process it gives the expected positive CO2 value.

As of now i'm using the copy of the original ecoinvent process as provider, if i switch to the original the issue is fixed, but that would require an excessivley long backtracking, does anyone know of a solution?

Answer 1

The direct calculation assumes that every product has only one provider (which reflects the simple ecoinvent 2 / Brightway / SimaPro model) and bypasses the creation of a product system; if this assumption is not correct for your copied database, you can get surprising results with it. Check the linking properties of your database (and better calculate via a product system then).