Power Draw 
The Kill-A-Watt shows a 200W draw to the network gear. Everything except the computer and the tape drive was a 100W draw; the tape drive is a 20W draw. This tells me that Jupiter is drawing approximately 80W. I turned the tape drive off, so we are running at about 180W, or 4 KW/h (so about 20 cents) per day to keep the network going.
Sometime I'll plug each piece in and get more precise draws, but I am betting that the 3c3000 is the biggest piece of the "everything else".