Hydro Tasmania is in an advanced stage of investigating its proposed 'Battery of the Nation' pumped hydro and wind turbine plan, including up to 4 additional Interconnector submarine cables (in addition to the existing Basslink cable) with the Mainland electricity grid.
See Becoming a renewable energy 'Battery of the Nation'
(full Report and also a Summary downloadable on this page)

https://www.hydro.com.au/clean-energy/battery-of-the-nation/future-state/more-information