I got free electricity as well but my suggestion will be to stay away from BTC miners. Wait until halving, right now mining firms using 16 nm chips and even 16 nm chips are not that profitable so maybe BTC will die or algorithm or block size will change in either way stay away from BTC this is not a good time to start mining. Maybe you can think of investing on BTC but this is risky (consider yourself warned)
where is your source that 16mn is not profitable if they are even using those? right now s7 is profitable, so a 16nm with double the efficiency must be more profitable to run, not by double like many think, because the efficiency is already at minimal, so the gain is very low
but the gain is still tangible