Alaska's Calcs are about right. I hooked mine up to a KillAWatt and saw it chewed about the same power as a 100w light bulb (standard bulb).
But, like, Behrmer, I generally keep mine turned off if I'm not using it.
I did all the wiring and such, and I'm pretty comfortable with it, but still. Crap happens.
Hell, I generally unplug almost everything if I'm leaving the house for an extended period, esp anything that charges.