Possible electrical wiring paths are blocked *everywhere* by glulam posts. What to do?
Also look into the Conduit wiring method.  This allows you to put up to four circuits (or even more with a wire size bump) into a single hole/pipe, instead of only one or two cables. 

This works because you are fitting individual wires into a pipe, instead of a sheathed cable containing multiple wires, so you don't have the bulk of the sheath, packing and grounds.  All the circuits in a pipe can share a ground, and if the pipe is metal, it can be the ground.