I am working on a building that will be owned operated by a charity in Australia. As a charity, they get free gas and very cheap electricity as a 'donation'. This means that their energy rates are not suitable to use in the PRM modelling and they do not access energy from they typical suppliers.

It seems reasonable to just pick a major commercial supplier and use their publically posted rates for a similar sized supply for gas and electricity. Would this be a suitable process for the energy rates on this building?