Its not free if you had to invest money in order to get it. To get free electricity, you need to find a deal where you pay a flat access to your electricity(Included in rent that you need anyways) and then consuming more electricity does not cost more money.
By saying that, do you mean that he can get electricity on rent and then get access to more electricity even at the same rates???
Yes, electricity is included in my rent, so if i put 5kW on miners, i pay the same monthly rent as if i have 0kW on miners. Otherwise electricity cost is under 0.06, which is very cheap still. (Up to 30kW)