Scope 2 Decarbonisation to drive Scope 1+2 SBT reduction

Dear community, I’m holding a sustainable sourcing role and engage regularly with suppliers on a range of sustainability issues. I’m trying to get suppliers to set Science Based Targets to reduce near term Scope 1 and 2. I understand that they may set combined Scope 1+2 targets. I’d like to validate and check if my suppliers can leverage on Scope 2 decarbonisation to drive their overall decarbonisation i.e. via rooftop solar energy generation to compensate for Scope 1 decarbonisation since it is more expensive to retrofit. Excess solar energy is generated on the rooftop is generated which offsets Scope 2 absolute emission and the sale of remaining renewable energy to the grid can be used to offset Scope 1 emission? Thanks in advance!