Which battery technology are you referring to?

Lithium-ion has pretty big operational safety concerns (thermal runaway) and as far as I know we haven’t completely figured out the recycling either.

Pumped storage has massive environmental implications and is typically very difficult to get approved by local governments.

Flow batteries are still a very infant technology. There’s very big design differences between manufacturers that have very big tradeoffs. But I do believe these will “win” the storage race, eventually.

Flywheel and gravity storage don’t have the magnitude and duration requirements for grid-level storage solutions.

Power company engineer here, it’s true that a lot of our supporting and analytics software went down during the AWS event.

However, most devices that actually control grid units (called bulk electric system cyber-assets) are air-gapped or utilize a data diode.

FERC Reliability Standards and NERC CIP

However-er, flipping through those standards just now, turns out it’s 100% permitted to connect your “bulk electric system cyber-asset” to a cloud integration if done compliantly.