At this point there may be little option. There probably has to be a period of 10 years or more where the coal fired power stations are seriously uneconomic with the the pricing mechanisms on the NEM. They are still needed however.All Victoria's coal plants are privately owned, and the owners want to shut them down earlier than they previously forecast.
What do you want the state to do? Follow what they proposed in NSW and donate hundreds of millions to the company to keep it open for 5 extra years?
My understanding is some other countries use similar pricing mechanisms to the NEM. This mechanism maximises wind and solar and makes it hard for coal to compete. A lot of countries use a different pricing mechanism which include capacity payments, a payment for guaranteeing power supply at some time frame in the future. This is not favourable for wind and solar who cannot guarantee power supply at any point in time.
In my eyes, the problem is due to a failure to plan realistically. The set up of privatised power generators and the bureaucracy of multiple bodies and states to run the NEM make a complex transition even more complex.
I cannot see how the Labour Party policy of spending 20 billion on transmission upgrades gets round the problem of the coal fired power stations being uneconomic. It may keep the problem to 10 years or a bit under, whereas the Coalition approach of meandering along may have made the problem last 15 years or more. The problem still exists however and has to be addressed.