This sounds risky... can you provide more details?
Where are the rigs located?
What are they going to be made up of? GPU? Asic? What models, and what does "upgraded" mean to you?
How do you have free electricity? That sounds unsustainable over 180 days.
Rigs are here in my country in European Union. I have good friend of mine who works for one big industrial company and I have my rigs there ... noone will ask why are my rigs there, friend will take care of that

I have also another friend who helped me "upgrade" my mining rigs and they are much more effecient than "stock gpus" and I dont want to reveal deteails here ..as I want to keep my odds here
Unsustainable ? why ?