Quick back-of-the-envelope: At $0.12/kWh, the shortfall is about 20kW of continuous power.
Do they have significant HVAC requirements? I don't think I see 20kW of iron in the two racks that get pictured.
On top of the electricity for the servers and for cooling, there is also maintenance: replacing ancient drives and other system components when they fail (which may require paying out the arse for some gear on eBay), fixing cooling equipment (ever replaced a dead AC unit in your house?), network maintenance and upgrades, internet connection, etc., etc. The list goes on and on. $20K seems reasonable to me. He's not asking for $20MM or even $200K, guys. He's not mining bitcoins. Please be reasonable.
It's requires 1/3 of a watt. For every watt of heat you need 1/3 of a watt of cooling. (For typical A/C's.)