Energy is solely a mechanic to limit the number of Quests you can do. This can be handled differently. This is not a fundamental change, as you would still do Quests it would just change the mechanic we use to Limit the number.
We have to analyze everything in the game and figure out what the "base" purpose of it is. Then decide if we like that implementation or if there is a different way to achieve the same result. Our early feedback is Energy is not needed.