Electricity is high, and going up all the time. I have 3 servers that run 24/7. My electric bill isn't too bad, though. I am sure the servers take more than a new one would, as they are older, with the newest one from 2006. I am pretty lucky, as I work for a telephone cooperative. We are also an internet provider, and do phone/voice/internet over fiber to the home, delivering a 1 gig ethernet connection to each house. Of course, it doesn't take anywhere near that much for a typical house, but it is there. Anytime we buy new servers, I either get the old ones for nothing, or buy them for little of nothing. I have tons of old computer hardware, and I don't get rid of any of it, as in my ham radio hobby, there is a lot of stuff that uses serial ports. Nowadays, there is no such thing without a usb-serial adapter. I have 5 or 6 of those but prefer to use the real thing. When it comes to old PC's and servers, I am a packratt.