"This angelic power might be just a LITTLE out of theme for Solars, but I'm Essence 6, so I can push out the boundaries of Solar themes just a LITTLE bit and go no, this is my angelic power charm.", essentially.

It doesn't let you make bigger booms or roll more dice or better dice, it just expands your themes a little in a way congruous with how you've been playing your character the last 80+ sessions.