It's a "battery" in the grid sense that it's an energy buffer which can be used to balance demand. If you can get over that stretch of terminology it's sort of

It's a "battery" in the grid sense that it's an energy buffer which can be used to balance demand. If you can get over that stretch of terminology it's sort of interesting. I've seen proposals for shifting HVAC systems to create even larger buffers - increasing or insulating chiller fluid capacity (or even creating large ice masses) so that during excess/low-cost power one can build up a reserve, then cooling from that reserve during high-demand periods.