I pay, last I checked, 0.06-0.08 kwh (depends on how much you use) and I still did the math to find that Hashnest will profit and turn an ROI quicker by at least 13%. So it will probably be about even, if not less because of cooling cost, security, etc. to run your own even at that good price of electricity. So for me after having done all that math, will most likely get into Hashnest either when they have s9 gh to offer or s7 after the halving.
If you have cheap power legitimately then I recommend to get into hosting. Just be upfront with your customers how much you charge and how much support you'll give them and I think a lot of people would be very interested in your rates. If you just marked up to $.06/kWh then you would be a lot less than the next competitive company.
BTW if you're will to host at $0.06/kWh then let me know