OpenNem data now over 14 years (select All & Month – the Sine Wave links to States) salient points State by State.
NSW – demand has fallen since the GFC – always a big importer – exports are minor – solar and wind increasing over last ~5 years.
Qld – demand has risen since the GFC – always an exporter – imports are minor – solar increasing over last ~5 years – wind and hydro minor – big increase in gas 2010 to 2014 then gas tails off somewhat.
Vic – demand has fallen since the GFC – mostly a minor importer – exports mostly grew till early 2017 when Hazelwood closed leaving exports weak – solar and wind increasing over last ~7 years.
SA – demand near constant since GFC – imports increased as coal withered and gas decreased in runup to coal ending – exports mostly weak but increased after early 2017(Hazelwood closed) – solar and wind increasing over last ~11 years.
Tas – demand near constant since GFC – imports dominate over exports – exports increased 2010-2014 due to cashing in on the carbon tax – imports at an all-time peak just before Basslink broke Dec 2015 – gas & diesel held the fort until Basslink was repaired mid 2016 – export surge winter spring 2018 due wet spell – wind increasing over last ~9 years, solar minor. Curiously in view of the dominance of hydro Tas AEMO wholesale prices are up there with SA and Vic the highest price states so far in 2019.