I don't know yet, I am waiting for our power meter to arrive to do some calculations. We are running a 1350W Enermax unit, which supposedly is capable of 4 x 290's (though I've not tried it yet). So by that rationale, we are drawing somewhere between 900-1000w of juice.

When our power meter arrives I will post up the numbers and work out what in real terms our power costs are.