They pull a TON of juice dude just to keep them going. You know what else they pull juice for (on a separate input?). Cooling. It's constant and it's REALLY expensive. Do I have to get into the principles of thermodynamics for the cooling part on this? As long as we can produce the heat onsite within a certain range (and also depending on the system type), we can cool the stacks without drawing a separate load to do the same thing. Also, the remaining waste heat can be used to heat the building, water tanks, etc.
Please do get into the thermodynamics. I'd love to know how you can cool something using nothing but heat. I'm sure there are also several multi-billion dollar companies wondering the same thing.
Actually several multi billion dollar corporations build absorptive refrigeration plants every single day. The majority of high rise buildings in every major city use absorptive chiller plants for cooling. Absorption cooling was invented by the French scientist Ferdinand Carré in 1858 and predates the direct expansion refrigeration systems you are familiar with by a long shot. We havent developed any new technology (yet) we're using existing technology to do something new and novel. This really isn't rocket surgery... its more like shade tree mechanics.