@JeremyECrawford does power surge deal extra damage to multiple targets with aoe spells?It says when you deal damage to a creature or object，you deal extra force damage to that target.
— xeno (@xenoexpert) November 10, 2017
The text of Power Surge says you deal extra damage to a target. The singular wording is intentional. If it worked against multiple targets at once, it would say so. #DnD https://t.co/q8ufYASld5
— Jeremy Crawford (@JeremyECrawford) November 10, 2017
This ruling is in conflict to another you gave me previously regarding Aid cast at higher levels. Aid also says “a target” but you clarified that the higher-level bonus effects each target. So the text will not always say when something will work against multiple targets. My tweet about Power Surge is only about Power Surge.
— Jeremy Crawford (@JeremyECrawford) November 10, 2017