Boost voltage? So taking a 115kv line and straight up converting it to a 345kv line actually will cause the need of a second conductor be strung per phase (not to mention each insulator needs to be changed out to protect the higher voltage) soon as you get to higher voltages not only does skin effect play a factor but so does corona emissions, simplest way to do that is dual conductor per phase.
So now you have twice the conductor in the air that requires twice the structural support. Twice the structural support prob needs wider ROW as spacing of conductors at 345 sure ain’t the same as 115. Right back to rebuilding a line plus a whole lot more.
Let alone all the 115kv breakers/busses and transformers then need to be converted at that station, you’re rebuilding the grid one station line at a time.
But it sure sounded easy to just say convert to higher voltages