POWER plane PCB design
It depends totally on where you need the power, how much power and on your power integrity requirements. 

I have done things like that on a single plane, or on 4 planes, it just depends on what you are about. 

I would note that running a split power plane with a closely coupled high speed signal layer is a bad idea from a return current perspective, so some care is advised, but there is nothing inherently wrong with split (even very split) planes if your part placement works with that.