There is currently a lot of debate around the future difficulty and the block halving which is taking place in July (block reward is changing from 25 to 12.5) so people are unsure about the real returns in a years time. Check that you calculator takes these things into account somehow! I am not too familiar with calculators yet so I'll leave that to someone else to discuss.

In regards to electricity prices if you have a business you can always get cheaper electricity from your retailer. I just remembered this tbh! I'm going to start my own sole trader business to get cheaper electricity at home.

The thing is just be smart and realistic about it, try and get as much info as you possibly can! Then make an informed decision my friend!