Thanks for the comment!
I wanted the player to be able to go to the next level whenever they reached 100%, but I also wanted the player to be able to see how much more energy they could produce before the rest of the time runs out. If you run out of time or pause the game after you have reached 100%, there is a button to go to the next level in the pause/out of time menu.
Alas, more non-tutorial levels were not possible in the given time. (To build a level, I had to manually link up every wire piece/component with the previous one...sigh...It took a while.)