This may be way out of your range and area, but have you looked into tieing into another substation feed if it's available to you? Fully redundant data centers will have multiple utility feeds coming from unique sub stations or power grids so that utility outages have a smaller profile of impacts and outages.
Of course, this is a long term and large scale investment. Some centers won't have them because it might come with a million dollar price tag to run a unique utility feed from where ever its junctioned. Sometimes you might get lucky and already have the unique feeds running close by and it's a simple matter of running a line back to your ATS.
Another costly option is to use rack mounted UPS or a stand alone UPS separate from the primary UPS' that's already conditioning the power for your data center. This is a customary practice for firms that are involved with some sort of power maintenance. Some business even use rack mounted UPS as a permanent solution to add more time to a black out window. Some rack mounted UPS can give you a couple more hours of up time in the event of an outage (depending on individual rack load).
I've seen places where they just have a handful of systems and place the critical systems on the rack mounted ups. A stand alone unit is much bigger and usually requires at least the equivalent footprint of a rack. But that can supply power to several racks depending on density.
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