> His install would have a net negative value to the Texas grid without it.

Absolutely untrue. Solar and wind can always just be disconnected at any moment. Wind resources are also a huge inertia source- windmill blades are massive grid stabilizers.

Renewable tech does not have a big coal fire they need to keep at a constant temperature. How about instead of requiring batteries with solar, we require coal plants to have sufficient bypass cooling that they don't need the load of a grid connection to stay cool.

Renewables are a boogeyman. The reality is simply that they are always able to undercut any fossil plant and they don't like that. It has fuck all to do with grid stability.