if its similar to this one its claimed to be about 1.32 KVA (just under 6A on 230V, so 12A on 115V), so would operate on a standard mains socket in most of the world, but the 25A inrush current would have be be dealt with (some circuit breakers might nuisance trip on it)
I do know that my last three landlords forbade even the idea of adding photovoltaic panels, or even a backup generator where I've lived.
As for gaming rigs... maybe? Probably? My rack doesn't even draw that much power (1.5A tops, the UPS still has some capacity). Only gaming rig I have access to has a 1kw PSU in it (and even then, it's a bit unstable).
feeding power *back* into the grid is another issue - all the wiring must handle it, electricity distributors will want "anti islanding" precautions to prevent any risk of backfeeding their network during a power cut - and changeover switches are needed for genset feeds (we have these at my work)
getting the IBM going is quite a good hobby project for winter, 1,2 kW can help keep the house warm too 😉
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