Utility Grid Scale Batteries are Lacking (can we fill a hole?), page-16

"...Hydro can be scheduled to demand if there is water of course..." and when Victorians are tucked up in bed overnight the coal burning in the Latrobe Valley recharges the water battery at Tumut 3 in the Snowy Mountains by pumping water back up into the dam... the level is remarkably lower on summer mornings ready for the aircons to get switched on along the eastern seaboard... now if I can put a family swimming pool on a tower in my backyard and get a turbine maybe I'll only need one Z Cell?