It's a fraction over 2000W at the wall, so $3700 per year from this. The only servers there are node servers so they need to be close as they fit in an enclosure (3x SL250s with dual E5 2697 V2s for HyperV, 2x SL230s with dual E5 2630 for shared storage, about 750W all up). Those big things with 25 drives in each up top are just JBOD enclosures. The node structure saves a lot of heat and power in having only 4 PSUs between them. "Home setup" is pushing it.