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)
if the inrush is exactly as IBM claim (and no higher), a European type B circuit breaker should be able to handle it (type C and D are also available for higher inrush current devices) but with high earth leakage it may have to be connected to power feed without RCD (GFCI).
(I am not sure what breakers are used/allowed in USA).
to be fair it is way less of a power hog than I'd have expected it to be, there are probably people here with gaming rigs using more power😆
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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