I've been speccing a home storage server in the 50-100tb range and was considering this, but annual electricity costs made it infeasible. How much power does a machine like this consume?

My calculation off a Dell 2U was something like 195W idle - ~900 kWH / year. I'm in California so paying 50 cents per kWH, that would be ~$450 per year -- decided to scale back to a low power tower with huge disks. More upfront, but less annually. More disk drives (6tb vs 18tb) increased that to the point where I figured it was better to have fewer larger disks, even if they are pricier, because of the cost to run them.