The people live underground. They were sent there because there was going to be some sort of war. Some children end up finding these solar powered things that provide energy. There were three books in the series and they made one into a movie (maybe more, not sure). This would have been in the last four or five years. I’d say older elementary school age readers…
Sounds like “Ember”
Yes, that’s it, TY!!
Except for the solar powered energy panels, which kind of threw me. Ember is underground (therefore, no sun). Nothing solar powered in The People of Sparks, either. Or The Prophet of Yonwood.
Good stories, though.