For calculating greenhouse Gas emissions: Has anyone used the WRI-WBCSD Greenhouse Gas Protocol Standard for international Projects?

This is stated as an ACP under international tips in the reference guide. The fuel mix has a large role to play in the GHG emissions to offset-(for 1000 MWh in Switzerland for instance - between 30 and 400MtCo2e). The USGBC does not specify the documentation that is required to justify the fuel mix chosen.

Has anyone filed this credit with this option before and what documentation was required?