I only have one grid connected where do I get a second?

Large consumers often have two independent grid feeds.

OK. I’m not a large consumer.

If you were to setup a GPU cluster in your basement and consume TWs of power, the grid going down would no longer be your problem. It would become their problem! /s

.. to the same grid. If you're lucky they're to different substations.

The number of people who had "independent" fiber connections which were routed through the same channel and destroyed by the same backhoe is so high it's a meme among sysadmins.

Do you disambiguate between failure of the grid and failure of the usine? Like failure of the power generator is not the same as cut wires. And in terms of AI and internet providers - both can be easily diversified.

Besides, what is it that you guys expect from a large scale provider of essentially experimental technology??

That's what a UPS and a backup generator were for, even before PV and industrial-scale batteries became a thing.

I fully agree on the snark, but if anyone seriously considers backup from grid...

Get an islanding-capable inverter separating your internal power setup from grid, connect it with battery systems - you can control battery charging and have "microgrid UPS" then. Combine it with solar power feeding as second feed into inverter. Scale battery and solar panels as needed. If you have third input, can add three-phase genset (I recommend looking for propane fueled one if you don't want to care about fuel going bad)

I have this pretty much and generating way too much power for our needs which is great. And that includes car charging for light but significant use. I export a lot during peak hours from the battery as there is a lot of surplus.

But I was snarking on "provider". There are 100s of providers where I live but one grid and you can't use two concurrently.

My backup in the past has been a local library for internet and laptop power and everything else can wait.