The City of Ember

The City of Ember - Jeanne DuPrau Another book I've read in Dystopia genre.I find myself loving this genre.It was a fun and quick read for me.I like the main characters,And I was so eager to know what will happen next that I started the next book in the series right away.
Ember is an underground city whose inhabitants think their city is the only light in the dark world.They have electricity,but they're about to run out of it.Recently they've experienced some blackouts .What if these blackouts continued forever?