btw you can always rent some hw and use it, sometimes is a good idea
cheap electricty wont help you solo mining, you need a pretty good damn equipments if you want to go with that route, we are now around 300p peta right?
without considering the diff, one should look at around 1 block per month at least, to begin with solo mining, this mean that at current diff you need around 80 tera or 70 antminers s5
70 antminers s5 are 70, cost 25k
and even with 1 block a month solo mining, the breakeven point would be at least half a year even with free electricity, most likely a year with cheap electricity (realistically). But better miners are always being produced, and the difficulty will likely rise too, so the breakeven point might be even longer than 1 year.