> You can see on the map at the bottom of this page that almost all the batteries are in areas that already have high amounts of renewables:

It could be - but the battery investments map also align with the map below which shows that these states (Texas & California) are also states suffering from blackouts.

https://worldpopulationreview.com/state-rankings/power-outag...

So while this could mean that storage is cheap, it could also mean 'Texas's mix and grid is unstable, particularly as it's not connected to the national grid, and this has opened the opportunity to profit from higher levels battery arbitrage that doesn't exist in a better balanced grid'