Currently ASIC hardware efficiency is around 1w per GH/s, things like Terraminers much worse anyway so anyway 1w per GH/s... 1000GH/s = 1TH/s at PB's current price around $2000 ($2 per GH/s)...
1w per GH/s for how long?
If it is 1w per GH/s and 1w is .001 kwh at .10 = .0001 per GH/s in electricity costs?
1000GH/s = 1000w x 87600hours (10years) = 87600 kwh x .10 = $876 / 1000 = .876cents per GH/s for electricity.
Also, cloudhashing is going to be selling contracts at $1.99 per GH/s starting aug 1. Are you saying that doesn't even cover the electricity for the year of the contract?