If there's a significant drop in the current demand of a 
power grid, the voltage of that grid could possibly jump.  

If enough of the loads are dropped, I guess there might 
be some power factor issues and power reflections back 
to the companies.  Not sure, but I think a large reflection 
bouncing around the Northeast grid is what popped most 
of the substations during the famous power outage in New 
England during the 60's. 

- Doug McKean 


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