Ta.Not to hand but it's basically due to loses in the system which start at burning the gas in the power station then the transmission line losses. The figure might have been for coal at Pt Augusta. So gas at Garden Island would be better but the principle is the same. Apart from the detail that gas in the line is not losing or doing anything until called upon whereas as keeping the grid energised and balanced consumes energy just doing that. So gas for heating and cooking and hot water (the latter is very dependant on use cycles) is the go if it is piped to the home and you have a 100 years supply on tap.
Does that apply when gas is at say about 45% and wind at 55% (as it is right now - sort of, there’s a bit of import I think from Vic which is about 80% brown coal and 20% wind)?