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.