Approximately 80% of the homes in my neighborhood have standby generators that all need to exercise weekly. You think it would be a nightmare but you almost don't even notice when Wednesday rolls around unless you are standing outside at just the right time.

Sewage lift stations and cell towers have generators that need to exercise as well and I've never once heard a complaint about this situation. Your local municipality probably has something like 10-40% of its average load available in automatic standby generation capacity.

These AI data centers shouldn't need backup power at all. The workload does not justify that kind of reliability. If you've got tens or hundreds of these facilities, you don't need every single one of them to serve as a resilient durable hub. You just need a few of those. An inference farm going down and having requests automatically retried elsewhere is not exactly rocket science.