What will be the monthly revenue?
What will be the yearly revenue?
Cost of maintenance?
TOTAL COST OF ELECTRICITY MONTHLY FOR ANY COMPANY OR INDUSTRY IN MY COUNTRY IS $4000
(electricity is cheap here)
Land (Space) have been bought by him
If you need to ask this questions on behalf of him, you should advice him to stop this idea.
Convince him to just buy bitcoins for 2 000 000 $, that is 1000 times easier to do, 1000 times safer than mining investmenet, 1000 times less complicated.