Regardless, according to ooc their average hashrate in March was ~3630TH/s. Say 1J/GH, and that's 2.7GWhr in March. $450,000/2.7GWh = $0.167/kWh. Obviously there's some pretty decent error bars there, but even if you said they had enough hashrate to mine (let's say 6500TH/s) BTC21000, that's $0.095/kWh.
Hydro666, which operates in the same place using the same hydro power, charges its customers $79 per kW per month. That works out to ~$0.11/KwH but is fully inclusive "Our pricing is fully inclusive (space, power, cooling, security, remote power reboot etc.)". And of course includes their profit margin. So its fair to assume KnC pays significantly less that than in electricity alone.
Id also assume KnC mines on different pools to reduce the variance.
Yeah, as I said pretty big error bars. There are lots of place that could be off, for instance if they're running much more than 1J/GH (and they very well might have been) that would lower the cost/kWh in the above as well. $450,000 might have also been $431,195 and got rounded up, or their billing cycle might have been March 6 to April 6 and that skews the power data.
Do you have a link for the Hydro666 offering? I can't find a website or really anything about them.