I helped design the medical center load shedding system for WASHOE MEDICAL CENTER in Reno Nevada. To integrate it with 3 Caterpillar Kato 120 Kw generators. Load shedding has to be programmable because each circuit has a different hierarchy and the ordinal can and will change. In the case of WMC it started with the operating theaters, elevators, utilities (HVAC) and then down through (I forgot) but suffice to say a few dozen other levels. It cannot be done without software commands even though the programming would be basic.
I think I mentioned on this forum how much I fought against "SMART" generator paralleling whose system was VACUUM TUBE TYPE. Bottom line was they had a seven ton generator jump through a concrete wall and end up on 4th Street on fire (flammable engine coolant!)
The process is moniker-ed LOAD SHEDDING.
And good freaking luck finding something. 400 Hz military aircraft and combat operation centers employ load shedding but this is way the hell and gone exotic.
EDIT***EDIT***EDIT
Here is a touch of Load Shedding...
http://etap.com/load-shedding/load-shedding-software.htm