"It can provide energy storage on an industrial scale, up to...

"It can provide energy storage on an industrial scale, up to several hundred megawatt hours – enough to power around 7,000 homes for a day; and is also small enough to fit inside a 20-foot shipping container, making it suitable for both on- and off-grid applications"

http://reneweconomy.com.au/2015/adelaide-sand-based-energy-storage-system-wins-govt-grant-28439

Western Australia's four biggest resources are sunshine, wind, waves and sand.  Would'nt it be good if their best energy option came from their most abundant resources?