Unless the 7 series comes soon, this next difficulty bump is pretty much going to make it impossible to break even on electricity.
7 series won't be coming for a while so you can forget about that idea. 6 series was just released not too long ago so the earliest we will see 7 series will be in the fall. Absolute latest would be Q1 of next year but realistically it's most likely going to happen in the winter around christmas time.