I'm not sure what you mean by second peak market?
Let me turn around the question, why should a gas plant get more for its electricity when it's indistinguishable from solar electricity?
I already wrote it: levels of service. A gas plant powers up in minutes. A coal plant in hours. A nuclear reactor in years. Solar and wind isn’t controllable at all.
I agree there's actually an issue here, ideally the price should be set by the next seller which just didn't get to sell.
It‘s still a gamble for suppliers btw. The prices change every 15 minutes, and every cheap supplier is at the whim of more expensive suppliers.
Whereas solar generators are ruining grid stability.
Eg: In your market, Australia, this was completed this year for $8 million AU
https://www.westernpower.com.au/resources-education/network-...
The battery banks in Adelaide an elsewhere are real - you can kick them.
You can price these against gas peaker turbine plants, and then compare the robustness of mini distributed storage nodes against larger single point of failure fossil fuel gas plants.
I understand the Western Power link provided looks like media hype, it was put together years back at the start of the project with minal updates in the interim.
It's well out of date now that the Walpole project has been completed and is up and running for a few months now.
Single massive peaker plants Vs. many smaller battery parks and pumped hydro nodes.
It depends upon the population distributions, topologies, power grid, etc.
Adelaide is a state capital with massive battery banks and large amounts of renewable energy, they have long periods of self suffiency and export excess power to neighbouring states.
This is dull power infrastructure engineering reality, not woo woo imaginary hype.