At that electricity cost, it will still take 9 months plus to break even (without considering rental/staff/VAT/shipping cost). With those other costs included, it will be longer.

The risks:

-New stronger machines will come in and damage current returns. There are farms in the past that have gone offline with weaker machines like S7. There are also bankrupt mining farms like KNC.
-Warranty is only 6 months and it takes longer ot break even.
-Difficulty climbs even higher than expected due to new asic manufacturers

There is also the risk of bitcoin price going downwards and never going back up or just bursting,etc. Nothing is ever risk free. U have a higher chance of breaking even but it is not a sure thing.