I live near one of the world’s largest grid scale battery facilities. It was in the news last year for catching fire and filling the air with lithium. [0] So I’m aware of the technology’s existence. But I also know that it’s still a very young technology, with battery chemistry constantly improving. There are also inherent losses going to and from AC power, which is what the grid operates on and which most plants produce.

[0] https://www.readymontereycounty.org/emergency/2025-moss-land...