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A gas power plant (specifically a peaker plant designed for this) is still more expensive to start or stop than a battery or hydro.

However, it is much more expensive to build the capacity for batteries and you need to charge the batteries with excess power that’s available cheaply during surplus times.

The advantage of a peaker gas plant is you can build it big and shovel fuel into it that you just brought over from wherever. Many of them were built with the expectation that they would not face competition from batteries, so the economics of running them is getting bad. However they’re still important as a backup because you cannot depend reliably on the batteries being charged.