Shane, interesting you mentioned diesel AND a coal plant. Often overlooked.
Some years back, I spoke to a bloke driving a dozer at Mt piper NSW, movimg/spreading ash, forget the exact figures but at that time, the plant had burned around 24 million tonne of coal and produced approx 4 million tonne of ash. He was working 3/12 shifts. Likely on a 24/7 rotation.
If I recall Gladstone Power station burns around 6mtpa of good low ash black coal. Every tonne plus over burdon must be mined (diesel) and transported (diesel and electric) +200km to get there.
I'm not against coal, but acknowledge it will take a reducing role in Australia's electricity generation as time moves forward although too many have their head in the sand or poorly educated to understand how slow this will need to be.
Everything that has been done to date reducing coal (less than 10% Nation wide over 10 years) has been easy, closing old inefficient power stations, not running at full capacity replaced with a bit of this and that and high power prices, better uterlising the newer power stations, removing govt from running power stations for political reasons (jobs) PLUS riding the back of the reduction of nearly 800MW of demand by just 2 former customers.
Closure of Liddel will also be relatively basic but expensive, SNOW Y 2.0, after Liddel its starts getting harder, alot harder with each station closing and why I think we would have been better off following the Dutch and building a modern clean coal 2000 - 2500 MW power station to replace the aging and brown coal rubbish in the south and enjoyed at 20 - 25% CO2 / MW reduction in emissions and still sustained affordable power prices.