No you miss the point. The only thing that can replace a...

No you miss the point. The only thing that can replace a generation unit is a generation and until then what is the point of storage that will use coal to charge them.
NEM as stated is a flawed market scheme that is manipulated by the bidders to hedge contracts and sometime the participants drive the price negative so they dont loose on fixed contracts. ie they buy there own power to sell to the fixed price contracts so actually make money, it's absurd but that's what happens. It just so happens when demand is low and solar input is high it creates the most favorable conditions for this to happen but it never represents a case when we have so much renewable energy that we need some where to store it.

I just say look at the renew economy graph at anytime, including when prices are negative and you see a lot of brown coal, black coal and now that prices have fallen, gas generation. NEVER ZERO or anywhere near it.

So you insist that the "surplus: renewable energy is used for storage when in fact it is never surplus and could be used to provide normal grid power. Instead lets pump up an energy storage with it and the shortfall in the grid will come from guess what brown and black coal. The evidence is staring you in the face, at this time, we never have surplus renewable energy. If you cant see that from the graphs from a renewable energy pro site then there is no hope for you, you are blinded. I don't need to review the wind capacity the company I worked for used to laugh at how figures were being manipulated to be favorable.