Initially Turnbull took the credit for that, but Bananaboy wanted to scrap it. HE just LOVES Turnbull.. you know.. . They envisage Coal could be stored this way. I would imaging it's ideal for wind and solar where the cost is low for the initial "excess" electricity.. You can't just turn COAL on and off and it's only efficient near full output. like diesel etc . ALL storage involves a cost penalty. (like taking it a long distance through transformers and wires) Battery response is almost instant. NOTHING beats it in that respect. No one, but no one is going to have a coal fired power station just sitting there, that can be powered up to fill a need in less than days and the cost of having it there unused just in case is ridiculous.. Why schedule a full overhaul in the hottest part of the year?. ALL the failures have been distribution (network) or coal fired power stations failing on hot days You won't get a cloudy day with no windover the WHOLE of Australia. Newer solar works on cloudy days..Nev