I'm not sure of the economics for both, but if we want more RE, then these have to happen and if the economics don't stand up, then the feds should simply "gift" the projects to the nation to enable power prices to be lowered without risk of blackouts. Another "gift project" will be the need for the HV link connecting SA to NSW and this will round off the above mentioned hydro projects providing greater geographic diversity for solar and wind generation. I'm expecting the SA-NSW HV link to be approved this year.
Interesting that Shorten is wanting to see the business case for SNowy 2.0. He knows full well it doesn't stack up, but he also knows full well he will be forced to do it if the LNP doesn't to achieve his RE targets, so as usual the Opposition bring nothing but BS to the table.
On top of Basslink 2.0, Tas Hydro is looking at installing pumped storage as a means to provide a battery for their wind projects, either under consideration or construction to better capitalise on Basslink 1 and 2 as well as better drought proof.
If all this happens, along with half the wind and solar projects currently in feasibility stage. Then yes Liddle can go quietly into the night along with another 1-2 coal power stations reducing the bass load power from 18-20GW to 12-14GW. However, thats all the low hanging fruit, what next? and does any of this make commercial sense who knows?