In my opinion, the amount of watts used is not that important - and the most important thing to consider is the amount of amps you can consume - for example 100 Amps…
In the UK, if you have a house/residential property, you’d normally get single phase of 80 amps or 100 amps (at the cut out) at 240V. If you had a business property, you may get three phase of 100 amps (at the cut out) on each phase.
I’ve had an electrician do my setup (drawing currently about 270 amps across three phase) and despite it all being done properly, I had one phase go down due to an electrical short which caused a lot of things to get very hot. He checked it and said there was no way he was going to touch it and that it was a job for the distribution company (the company that look after the cabling infrastructure).
With the amount of watts you are using, regardless of how many volts coming into your building is something that I strongly advise you give the job to a qualified electrician to do - and let them work out the details to ensure your setup is safe and not likely to burn down… With the amount of electricity you are using, there are no second chances really.