One thing not clear is how they are meaning 'grid storage'. Storing energy in the grid has a few methods, but mostly aren't what one would imagine it to mean.
If it's a battery backup, that's going to be HUGE batteries and wouldn't really do much more than provide a segment of the grid with a backup power in a time of failure that MIGHT list minutes to hours (lots of variables).
Agreed on green energy. Even at face value with tech specs and weather patterns; solar north of Texas is a losing proposition (until the conversion efficiency is in the 80% range, where typical is 30-40%, last I looked into it). Wind power is fine if you have a turbine attached to your farm land, great for load shedding but less so for grid scale production.
Grid storage generally means water, wheel, or heat. Green electricity is especially problematic for grid stability. As wind can hugely fluctuate and large clouds can dramatically effect solar output. These huge and rapid transient events can be significantly smoothed with some form of grid storage. The result is improved grid stability.
The problem is, an outage of the storage (battery fire, and has repeatedly happened in the past), can knock the total segment capacity offline. Which means, for reliability you still need fossil or nuclear to back it. Which means idle surplus capacity equal to that farm's capacity.
Which now means the green cost is green + grid storage + fossil backing capacity which you're demanding to remain idle. So yaaa... more expensive electricity for the same reliability.
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