I saw there was no answer to your question. I may be too late and not helpful anyway. I was not in a balcony, but on deck 2 oceanview there were outlets next to the bed on both sides. The were 2 prong only. I can’t guarantee but would think it odd that OV would have them and not balcony. They have added an additional set by the desk also. (they appear like a newer addition perhaps in the 2018 renovation, we didn’t have them on our 2014 cruise)