My uneducated guess would be shared power infrastructure, easier licensing and permitting for one site, one large safety/fire extinguishment system instead of m

My uneducated guess would be shared power infrastructure, easier licensing and permitting for one site, one large safety/fire extinguishment system instead of many, etc. The article mentions only 2 transformers needed to link that entire station to the grid. Also the controls, managing power delivery from thousands of small batteries versus one centralized facility. And if that particular wind or solar project doesn't go well for some reason the battery isn't tied to it, it's stabilizing the overall grid. Not sure though it is a good question, probably some technical or regulatory docs that go into details somewhere, I'd imagine this would have a ton of bureaucracy before getting built