For reference, my PG&E bill splits out transmission/delivery and generation very conveniently, since SF provides its own power generation utility service. It appears to be closer to 60/40. At PG&E generation rates (a little higher), perhaps up to 55/45.
Incidentally, $0.13748/kWh in generation costs, with an increase of only $0.01/kWh for exclusive wind/solar sourcing.