That's funny, because I was going to ask you the same thing.  They don't care about power as they usually give you a set amount of power depend on the amount of rack spaces you are leasing:  typically 20-amp 220-V for a full 42U rack, with only 16-amp usable = 3.3kW, enough to power a whopping one 3TH miner.  You can't plug any more equipment in the rack and power it from the same circuit as it will overload and trip the circuit breaker.  You will have to pay additional fee to get more power in, typically at least $200+ per additional 20-amp circuit and that's without any A+B redundancy power feeds.  That's right for power redundancy, you will have to pay another $200 for 20-AMP of standby power that you cannot use.  Otherwise if one of your circuit went out even for just a split second (due to power failure/UPS/breaker), you will now be running twice the power on the second circuit thus tripping the breaker on that circuit and all your equipment is shut down...  How do I know?  I was responsible for relocating all of my last company's servers from the various offices into a colocation with redundant power feeds from the power company, backup diesel generators, redundant climate control, redundant data circuit, secure access, etc..  I shopped around extensively and it is not cheap.  My current employer has almost 1000 servers at their off-site data center and they spent several millions per years in data center costs.  That's not even counting the salary of the staffs necessary to support such a large DC operations.